diff --git a/build-number.txt b/build-number.txt
index 274c0052..81187442 100644
--- a/build-number.txt
+++ b/build-number.txt
@@ -1 +1 @@
-1234
\ No newline at end of file
+1235
\ No newline at end of file
diff --git a/src/main/java/me/chayapak1/chomens_bot/plugins/PlayersPersistentDataPlugin.java b/src/main/java/me/chayapak1/chomens_bot/plugins/PlayersPersistentDataPlugin.java
index 8f45de6b..30879bfe 100644
--- a/src/main/java/me/chayapak1/chomens_bot/plugins/PlayersPersistentDataPlugin.java
+++ b/src/main/java/me/chayapak1/chomens_bot/plugins/PlayersPersistentDataPlugin.java
@@ -86,6 +86,8 @@ public class PlayersPersistentDataPlugin extends PlayersPlugin.Listener {
     public void playerLeft(PlayerEntry target) {
         bot.executorService.submit(() -> {
             try {
+                lock.lock();
+
                 if (!playersObject.has(getName(target))) return;
 
                 final ObjectNode player = (ObjectNode) playersObject.get(getName(target));