diff --git a/src/SimpleAuth/task/ShowMessageTask.php b/src/SimpleAuth/task/ShowMessageTask.php
index ca07d1f..aefc164 100644
--- a/src/SimpleAuth/task/ShowMessageTask.php
+++ b/src/SimpleAuth/task/ShowMessageTask.php
@@ -43,7 +43,8 @@ public function addPlayer(Player $player){
 	}
 
 	public function removePlayer(Player $player){
-		unset($this->playerList[$player->getUniqueId()->toString()]);
+		if ($player->getUniqueId() != null)
+			unset($this->playerList[$player->getUniqueId()->toString()]);
 	}
 
 	public function onRun($currentTick){
@@ -57,4 +58,4 @@ public function onRun($currentTick){
 		}
 	}
 
-}
\ No newline at end of file
+}