diff --git a/ahm5t3rg19.js b/ahm5t3rg19.js
index 26cfbea..832050c 100644
--- a/ahm5t3rg19.js
+++ b/ahm5t3rg19.js
@@ -33,7 +33,10 @@ this.subscription = GameLib.Event.Subscribe(
 	function(data) {
 		if (data.audio.name === 'Audio - Flamethrower') {
 			GameLib.Event.Emit(GameLib.Event.MOUSE_UP);
-			this.subscription.remove();
+			if (this.subscription) {
+				this.subscription.remove();
+				this.subscription = null;
+			}
 		}
 	}.bind(this)
 );