track-entry-listeners.js:38 Uncaught TypeError: Cannot read property ‘listener’ of null
at Function.422.TrackEntryListeners.getListeners (track-entry-listeners.js:38)
at sp_Skeleton.setTrackCompleteListener (Skeleton.js:1249)
at MonsterSpineControl.changeStateCallback (MonsterSpineControl.js:253)
at Object.emit (GlobalEvent.js:16)
at MonsterData.changeState (MonsterData.js:110)
at Object.killAllMonster (MonsterWaveManager.js:193)
at Object.nextLevel (LevelData.js:98)
at Object.parseData (KillMonsterData.js:32)
at Object.response. [as game.gameHandler.killMonster] (Response.js:41)
at Request.js:174
求解答这个问题， 是我在跳转到其他页面的时候弹出来的错误 ， 跳转回页面的时候又弹了一次这个错误