===================================================================
--- original.js
+++ change.js
@@ -85,9 +85,11 @@
 	game.addChild(bullet);
 }
 // Handle player movement
 game.move = function (x, y, obj) {
-	player.move(x, y);
+	if (player) {
+		player.move(x, y);
+	}
 };
 // Handle shooting
 game.down = function (x, y, obj) {
 	shootBullet();