diff --git a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/TickTask.java b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/TickTask.java
index 9811d2d4..92a94a28 100644
--- a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/TickTask.java
+++ b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/TickTask.java
@@ -175,7 +175,9 @@ public class TickTask implements Runnable {
 	public static void addTickListener(TickListener listener){
 		synchronized (tickListeners) {
 			if (locked) return;
-			tickListeners.add(listener);
+			if (!tickListeners.contains(listener)){
+				tickListeners.add(listener);
+			}
 		}
 	}