diff --git a/game/game.js b/game/game.js
index 1325446c7..5eeece82d 100644
--- a/game/game.js
+++ b/game/game.js
@@ -41293,7 +41293,7 @@
 						event.callHandler(event.getDefaultHandlerType(),event,{
 							state:'end'
 						});
-						event.step++;
+						if(typeof event.step=="number") ++event.step;
 					}
 				}
 			}