diff --git a/src/main/java/noppes/npcs/controllers/PlayerDataController.java b/src/main/java/noppes/npcs/controllers/PlayerDataController.java
index a8bc3b215..31b2cdeb7 100644
--- a/src/main/java/noppes/npcs/controllers/PlayerDataController.java
+++ b/src/main/java/noppes/npcs/controllers/PlayerDataController.java
@@ -168,7 +168,7 @@ public class PlayerDataController {
 		readNBT(nbttagcompound);
 	}
 
-	public void savePlayerDataMap(){
+	public synchronized void savePlayerDataMap(){
 		CustomNPCsScheduler.runTack(() -> {
 			try {
 				File saveDir = getSaveDir();