diff --git a/L2J_Mobius_1.0_Ertheia/dist/game/data/scripts/instances/AbstractInstance.java b/L2J_Mobius_1.0_Ertheia/dist/game/data/scripts/instances/AbstractInstance.java
index f65779aa09..22d5b8a736 100644
--- a/L2J_Mobius_1.0_Ertheia/dist/game/data/scripts/instances/AbstractInstance.java
+++ b/L2J_Mobius_1.0_Ertheia/dist/game/data/scripts/instances/AbstractInstance.java
@@ -30,6 +30,7 @@ import com.l2jmobius.gameserver.model.instancezone.InstanceTemplate;
 import com.l2jmobius.gameserver.network.NpcStringId;
 import com.l2jmobius.gameserver.network.SystemMessageId;
 import com.l2jmobius.gameserver.network.serverpackets.ExShowScreenMessage;
+import com.l2jmobius.gameserver.network.serverpackets.SystemMessage;
 
 import ai.AbstractNpcAI;
 
@@ -159,6 +160,16 @@ public abstract class AbstractInstance extends AbstractNpcAI
 				}
 			}
 			
+			// Check if any player from the group has already finished the instance
+			for (L2PcInstance member : enterGroup)
+			{
+				if (InstanceManager.getInstance().getInstanceTime(member, templateId) > 0)
+				{
+					enterGroup.forEach(p -> p.sendPacket(SystemMessage.getSystemMessage(SystemMessageId.C1_MAY_NOT_RE_ENTER_YET).addString(member.getName())));
+					return;
+				}
+			}
+			
 			// Create new instance for enter player group
 			instance = manager.createInstance(template, player);
 			
diff --git a/L2J_Mobius_2.5_Underground/dist/game/data/scripts/instances/AbstractInstance.java b/L2J_Mobius_2.5_Underground/dist/game/data/scripts/instances/AbstractInstance.java
index f65779aa09..22d5b8a736 100644
--- a/L2J_Mobius_2.5_Underground/dist/game/data/scripts/instances/AbstractInstance.java
+++ b/L2J_Mobius_2.5_Underground/dist/game/data/scripts/instances/AbstractInstance.java
@@ -30,6 +30,7 @@ import com.l2jmobius.gameserver.model.instancezone.InstanceTemplate;
 import com.l2jmobius.gameserver.network.NpcStringId;
 import com.l2jmobius.gameserver.network.SystemMessageId;
 import com.l2jmobius.gameserver.network.serverpackets.ExShowScreenMessage;
+import com.l2jmobius.gameserver.network.serverpackets.SystemMessage;
 
 import ai.AbstractNpcAI;
 
@@ -159,6 +160,16 @@ public abstract class AbstractInstance extends AbstractNpcAI
 				}
 			}
 			
+			// Check if any player from the group has already finished the instance
+			for (L2PcInstance member : enterGroup)
+			{
+				if (InstanceManager.getInstance().getInstanceTime(member, templateId) > 0)
+				{
+					enterGroup.forEach(p -> p.sendPacket(SystemMessage.getSystemMessage(SystemMessageId.C1_MAY_NOT_RE_ENTER_YET).addString(member.getName())));
+					return;
+				}
+			}
+			
 			// Create new instance for enter player group
 			instance = manager.createInstance(template, player);
 			
diff --git a/L2J_Mobius_3.0_Helios/dist/game/data/scripts/instances/AbstractInstance.java b/L2J_Mobius_3.0_Helios/dist/game/data/scripts/instances/AbstractInstance.java
index f65779aa09..22d5b8a736 100644
--- a/L2J_Mobius_3.0_Helios/dist/game/data/scripts/instances/AbstractInstance.java
+++ b/L2J_Mobius_3.0_Helios/dist/game/data/scripts/instances/AbstractInstance.java
@@ -30,6 +30,7 @@ import com.l2jmobius.gameserver.model.instancezone.InstanceTemplate;
 import com.l2jmobius.gameserver.network.NpcStringId;
 import com.l2jmobius.gameserver.network.SystemMessageId;
 import com.l2jmobius.gameserver.network.serverpackets.ExShowScreenMessage;
+import com.l2jmobius.gameserver.network.serverpackets.SystemMessage;
 
 import ai.AbstractNpcAI;
 
@@ -159,6 +160,16 @@ public abstract class AbstractInstance extends AbstractNpcAI
 				}
 			}
 			
+			// Check if any player from the group has already finished the instance
+			for (L2PcInstance member : enterGroup)
+			{
+				if (InstanceManager.getInstance().getInstanceTime(member, templateId) > 0)
+				{
+					enterGroup.forEach(p -> p.sendPacket(SystemMessage.getSystemMessage(SystemMessageId.C1_MAY_NOT_RE_ENTER_YET).addString(member.getName())));
+					return;
+				}
+			}
+			
 			// Create new instance for enter player group
 			instance = manager.createInstance(template, player);
 			
diff --git a/L2J_Mobius_4.0_GrandCrusade/dist/game/data/scripts/instances/AbstractInstance.java b/L2J_Mobius_4.0_GrandCrusade/dist/game/data/scripts/instances/AbstractInstance.java
index f65779aa09..22d5b8a736 100644
--- a/L2J_Mobius_4.0_GrandCrusade/dist/game/data/scripts/instances/AbstractInstance.java
+++ b/L2J_Mobius_4.0_GrandCrusade/dist/game/data/scripts/instances/AbstractInstance.java
@@ -30,6 +30,7 @@ import com.l2jmobius.gameserver.model.instancezone.InstanceTemplate;
 import com.l2jmobius.gameserver.network.NpcStringId;
 import com.l2jmobius.gameserver.network.SystemMessageId;
 import com.l2jmobius.gameserver.network.serverpackets.ExShowScreenMessage;
+import com.l2jmobius.gameserver.network.serverpackets.SystemMessage;
 
 import ai.AbstractNpcAI;
 
@@ -159,6 +160,16 @@ public abstract class AbstractInstance extends AbstractNpcAI
 				}
 			}
 			
+			// Check if any player from the group has already finished the instance
+			for (L2PcInstance member : enterGroup)
+			{
+				if (InstanceManager.getInstance().getInstanceTime(member, templateId) > 0)
+				{
+					enterGroup.forEach(p -> p.sendPacket(SystemMessage.getSystemMessage(SystemMessageId.C1_MAY_NOT_RE_ENTER_YET).addString(member.getName())));
+					return;
+				}
+			}
+			
 			// Create new instance for enter player group
 			instance = manager.createInstance(template, player);
 			
diff --git a/L2J_Mobius_Classic_2.0_Saviors/dist/game/data/scripts/instances/AbstractInstance.java b/L2J_Mobius_Classic_2.0_Saviors/dist/game/data/scripts/instances/AbstractInstance.java
index f65779aa09..22d5b8a736 100644
--- a/L2J_Mobius_Classic_2.0_Saviors/dist/game/data/scripts/instances/AbstractInstance.java
+++ b/L2J_Mobius_Classic_2.0_Saviors/dist/game/data/scripts/instances/AbstractInstance.java
@@ -30,6 +30,7 @@ import com.l2jmobius.gameserver.model.instancezone.InstanceTemplate;
 import com.l2jmobius.gameserver.network.NpcStringId;
 import com.l2jmobius.gameserver.network.SystemMessageId;
 import com.l2jmobius.gameserver.network.serverpackets.ExShowScreenMessage;
+import com.l2jmobius.gameserver.network.serverpackets.SystemMessage;
 
 import ai.AbstractNpcAI;
 
@@ -159,6 +160,16 @@ public abstract class AbstractInstance extends AbstractNpcAI
 				}
 			}
 			
+			// Check if any player from the group has already finished the instance
+			for (L2PcInstance member : enterGroup)
+			{
+				if (InstanceManager.getInstance().getInstanceTime(member, templateId) > 0)
+				{
+					enterGroup.forEach(p -> p.sendPacket(SystemMessage.getSystemMessage(SystemMessageId.C1_MAY_NOT_RE_ENTER_YET).addString(member.getName())));
+					return;
+				}
+			}
+			
 			// Create new instance for enter player group
 			instance = manager.createInstance(template, player);