diff --git a/demo/game/index.js b/demo/game/index.js
index 7dd24e1..58f2409 100644
--- a/demo/game/index.js
+++ b/demo/game/index.js
@@ -38,7 +38,9 @@ export default class Game extends Component {
   }
 
   componentWillUnmount() {
-    this.stopMusic();
+    if(this.stopMusic){
+      this.stopMusic();
+    }
     this.keyListener.unsubscribe();
   }