diff --git a/L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index 3d55a921d4..2dec9515e8 100644
--- a/L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -87,7 +87,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -183,7 +183,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{
diff --git a/L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index 3d55a921d4..2dec9515e8 100644
--- a/L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -87,7 +87,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -183,7 +183,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{
diff --git a/L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index 3d55a921d4..2dec9515e8 100644
--- a/L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -87,7 +87,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -183,7 +183,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{
diff --git a/L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index 3d55a921d4..2dec9515e8 100644
--- a/L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -87,7 +87,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -183,7 +183,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{
diff --git a/L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index e989a67ae3..91f87a9c86 100644
--- a/L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -376,7 +376,7 @@ public final class SpawnTable implements IGameXmlReader
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -470,7 +470,7 @@ public final class SpawnTable implements IGameXmlReader
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{
diff --git a/L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index 3d55a921d4..2dec9515e8 100644
--- a/L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -87,7 +87,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -183,7 +183,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{
diff --git a/L2J_Mobius_Classic_2.1_Zaken/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_Classic_2.1_Zaken/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index 3d55a921d4..2dec9515e8 100644
--- a/L2J_Mobius_Classic_2.1_Zaken/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_Classic_2.1_Zaken/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -87,7 +87,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -183,7 +183,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{
diff --git a/L2J_Mobius_Classic_2.2_Antharas/java/com/l2jmobius/gameserver/datatables/SpawnTable.java b/L2J_Mobius_Classic_2.2_Antharas/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
index 3d55a921d4..2dec9515e8 100644
--- a/L2J_Mobius_Classic_2.2_Antharas/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
+++ b/L2J_Mobius_Classic_2.2_Antharas/java/com/l2jmobius/gameserver/datatables/SpawnTable.java
@@ -87,7 +87,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to add
 	 * @param store if {@code true} it'll be saved in the spawn XML files
 	 */
-	public void addNewSpawn(L2Spawn spawn, boolean store)
+	public synchronized void addNewSpawn(L2Spawn spawn, boolean store)
 	{
 		addSpawn(spawn);
 		
@@ -183,7 +183,7 @@ public final class SpawnTable
 	 * @param spawn the spawn to delete
 	 * @param update if {@code true} the spawn XML files will be updated
 	 */
-	public void deleteSpawn(L2Spawn spawn, boolean update)
+	public synchronized void deleteSpawn(L2Spawn spawn, boolean update)
 	{
 		if (!removeSpawn(spawn))
 		{