首次使用 cc.director.runScene()跳场景1没有问题，从第二次使用 cc.director.runScene（）跳场景1报错如下
deprecated.js:148 Uncaught TypeError: Cannot read property ‘length’ of null
at CCClass._activateNodeRecursively (deprecated.js:148)
at CCClass.activateNode (deprecated.js:192)
at cc_Scene._activate (cocos2d-js-for-preview.js:20008)
at 102.cc.Director.runSceneImmediate (cocos2d-js-for-preview.js:17633)
at 102.cc.Director. (cocos2d-js-for-preview.js:17645)
at 102.cc.Director.284.proto.emit (CCAudioClip.js:1)
at 102.cc.Director.mainLoop (shape-module.ts:371)
at callback (enum.ts:97)
有遇到同样问题的吗，求教
