有的时候是在onTouchBegan，onTouchMoved也会报，里面我自定义了一个事件，
cc.eventManager.dispatchEvent(event);
这个异常有人遇到过么？
Uncaught TypeError: Cannot read property ‘__instanceId’ of null
cc.eventManager._sortEventListenersOfSceneGraphPriorityDes CCEventManager.js:322
cc.eventManager._sortListenersOfSceneGraphPriority CCEventManager.js:317
cc.eventManager._sortEventListeners CCEventManager.js:296
cc.eventManager.dispatchEvent CCEventManager.js:908
cc.EventListener.create.onTouchBegan Pattern.js:216
cc.eventManager._onTouchEventCallback CCEventManager.js:427
cc.eventManager._dispatchEventToListeners CCEventManager.js:563
cc.eventManager._dispatchTouchEvent CCEventManager.js:483
cc.eventManager.dispatchEvent CCEventManager.js:902
cc.inputManager.handleTouchesBegin CCInputManager.js:116
(anonymous function) CCInputManager.js:355