World object null checks.

L2J_Mobius_1.0_Ertheia/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_1.0_Ertheia/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_2.5_Underground/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_2.5_Underground/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_3.0_Helios/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_3.0_Helios/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_4.0_GrandCrusade/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_4.0_GrandCrusade/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_5.0_Salvation/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_5.0_Salvation/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_5.5_EtinasFate/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_5.5_EtinasFate/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_6.0_Fafurion/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_6.0_Fafurion/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_7.0_PreludeOfWar/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_7.0_PreludeOfWar/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_C4_ScionsOfDestiny/java/org/l2jmobius/gameserver/model/World.java

@@ -300,6 +300,10 @@ public class World
 			for (int i = 0; i < visibleObjects.size(); i++)
 			{
 				final WorldObject wo = visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
 				
 				// Add the object in WorldObjectHashSet(WorldObject) _knownObjects of the visible Creature according to conditions :
 				// - Creature is visible
@@ -332,6 +336,10 @@ public class World
 		for (int i = 0; i < visibleObjects.size(); i++)
 		{
 			final WorldObject wo = visibleObjects.get(i);
+			if (wo == null)
+			{
+				continue;
+			}
 			
 			// Add the object in WorldObjectHashSet(WorldObject) _knownObjects of the visible Creature according to conditions :
 			// - Creature is visible
@@ -413,11 +421,15 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
+				if (wo == null)
+				{
+					continue;
+				}
 				
 				// Remove the WorldObject from the WorldObjectHashSet(WorldObject) _knownObjects of the surrounding WorldRegion Creatures
 				// If object is a PlayerInstance, remove the WorldObject from the WorldObjectHashSet(PlayerInstance) _knownPlayer of the surrounding WorldRegion Creatures
 				// If object is targeted by one of the surrounding WorldRegion Creatures, cancel ATTACK and cast
-				if ((wo != null) && (wo.getKnownList() != null))
+				if (wo.getKnownList() != null)
 				{
 					wo.getKnownList().removeKnownObject(object);
 				}

L2J_Mobius_C4_ScionsOfDestiny/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -125,6 +125,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo instanceof Attackable)
 				{
 					final Attackable mob = (Attackable) wo;
@@ -173,6 +178,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo instanceof Attackable)
 				{
 					// Start HP/MP/CP Regeneration task
@@ -204,7 +214,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}
@@ -382,10 +393,15 @@ public class WorldRegion
 		LOGGER.info("Deleting all visible NPCs in Region: " + getName());
 		for (int i = 0; i < _visibleObjects.size(); i++)
 		{
-			final WorldObject obj = _visibleObjects.get(i);
+			final WorldObject wo = _visibleObjects.get(i);
-			if (obj instanceof NpcInstance)
+			if (wo == null)
 			{
-				final NpcInstance target = (NpcInstance) obj;
+				continue;
+			}
+			
+			if (wo instanceof NpcInstance)
+			{
+				final NpcInstance target = (NpcInstance) wo;
 				target.deleteMe();
 				final Spawn spawn = target.getSpawn();
 				if (spawn != null)

L2J_Mobius_C6_Interlude/java/org/l2jmobius/gameserver/model/World.java

@@ -300,6 +300,10 @@ public class World
 			for (int i = 0; i < visibleObjects.size(); i++)
 			{
 				final WorldObject wo = visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
 				
 				// Add the object in WorldObjectHashSet(WorldObject) _knownObjects of the visible Creature according to conditions :
 				// - Creature is visible
@@ -332,6 +336,10 @@ public class World
 		for (int i = 0; i < visibleObjects.size(); i++)
 		{
 			final WorldObject wo = visibleObjects.get(i);
+			if (wo == null)
+			{
+				continue;
+			}
 			
 			// Add the object in WorldObjectHashSet(WorldObject) _knownObjects of the visible Creature according to conditions :
 			// - Creature is visible
@@ -413,11 +421,15 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
+				if (wo == null)
+				{
+					continue;
+				}
 				
 				// Remove the WorldObject from the WorldObjectHashSet(WorldObject) _knownObjects of the surrounding WorldRegion Creatures
 				// If object is a PlayerInstance, remove the WorldObject from the WorldObjectHashSet(PlayerInstance) _knownPlayer of the surrounding WorldRegion Creatures
 				// If object is targeted by one of the surrounding WorldRegion Creatures, cancel ATTACK and cast
-				if ((wo != null) && (wo.getKnownList() != null))
+				if (wo.getKnownList() != null)
 				{
 					wo.getKnownList().removeKnownObject(object);
 				}

L2J_Mobius_C6_Interlude/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -125,6 +125,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo instanceof Attackable)
 				{
 					final Attackable mob = (Attackable) wo;
@@ -173,6 +178,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo instanceof Attackable)
 				{
 					// Start HP/MP/CP Regeneration task
@@ -204,7 +214,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}
@@ -382,10 +393,15 @@ public class WorldRegion
 		LOGGER.info("Deleting all visible NPCs in Region: " + getName());
 		for (int i = 0; i < _visibleObjects.size(); i++)
 		{
-			final WorldObject obj = _visibleObjects.get(i);
+			final WorldObject wo = _visibleObjects.get(i);
-			if (obj instanceof NpcInstance)
+			if (wo == null)
 			{
-				final NpcInstance target = (NpcInstance) obj;
+				continue;
+			}
+			
+			if (wo instanceof NpcInstance)
+			{
+				final NpcInstance target = (NpcInstance) wo;
 				target.deleteMe();
 				final Spawn spawn = target.getSpawn();
 				if (spawn != null)

L2J_Mobius_CT_2.4_Epilogue/java/org/l2jmobius/gameserver/model/World.java

@@ -409,7 +409,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -478,7 +478,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -538,7 +538,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceId() != object.getInstanceId()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceId() != object.getInstanceId()))
 				{
 					continue;
 				}

L2J_Mobius_CT_2.4_Epilogue/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_CT_2.6_HighFive/java/org/l2jmobius/gameserver/model/World.java

@@ -409,7 +409,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -478,7 +478,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -538,7 +538,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceId() != object.getInstanceId()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceId() != object.getInstanceId()))
 				{
 					continue;
 				}

L2J_Mobius_CT_2.6_HighFive/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_Classic_2.0_Saviors/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_Classic_2.0_Saviors/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_Classic_2.1_Zaken/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_Classic_2.1_Zaken/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_Classic_2.2_Antharas/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_Classic_2.2_Antharas/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_Classic_2.3_SevenSigns/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_Classic_2.3_SevenSigns/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_Classic_2.4_SecretOfEmpire/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_Classic_2.4_SecretOfEmpire/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}

L2J_Mobius_Classic_Interlude/java/org/l2jmobius/gameserver/model/World.java

@@ -413,7 +413,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -482,7 +482,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if (wo == object)
+				if ((wo == null) || (wo == object))
 				{
 					continue;
 				}
@@ -542,7 +542,7 @@ public class World
 			for (int j = 0; j < visibleObjects.size(); j++)
 			{
 				final WorldObject wo = visibleObjects.get(j);
-				if ((wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
+				if ((wo == null) || (wo == object) || (wo.getInstanceWorld() != object.getInstanceWorld()))
 				{
 					continue;
 				}

L2J_Mobius_Classic_Interlude/java/org/l2jmobius/gameserver/model/WorldRegion.java

@@ -55,6 +55,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					final Attackable mob = (Attackable) wo;
@@ -91,6 +96,11 @@ public class WorldRegion
 			for (int i = 0; i < _visibleObjects.size(); i++)
 			{
 				final WorldObject wo = _visibleObjects.get(i);
+				if (wo == null)
+				{
+					continue;
+				}
+				
 				if (wo.isAttackable())
 				{
 					// Start HP/MP/CP regeneration task.
@@ -120,7 +130,8 @@ public class WorldRegion
 				final List<WorldObject> regionObjects = worldRegion.getVisibleObjects();
 				for (int j = 0; j < regionObjects.size(); j++)
 				{
-					if (regionObjects.get(j).isPlayable())
+					final WorldObject wo = regionObjects.get(j);
+					if ((wo != null) && wo.isPlayable())
 					{
 						return false;
 					}