在编辑动画时，把speed设置成了0.5后，控制台一直输出这个报错 creator版本是2.0.2
2018-10-15T01:47:39.277Z - error: TypeError: Cannot read property ‘time’ of null
at refreshScene (D:\Program Files\CocosCreator\resources\engine\bin.cache\dev\cocos2d\core\base-ui\CCWidgetManager.js:237:67)
at cc.Director.CallbacksInvoker.invoke (D:\Program Files\CocosCreator\resources\engine\bin.cache\dev\cocos2d\core\platform\callbacks-invoker.js:167:29)
at cc.Director.mainLoop.CC_EDITOR._purgeDirectorInNextLoop [as mainLoop] (D:\Program Files\CocosCreator\resources\engine\bin.cache\dev\cocos2d\core\CCDirector.js:438:26)
at EditorEngine.tickInEditMode (D:\Program Files\CocosCreator\resources\app.asar\editor\page\scene-utils\editor-engine\index.js:1:2597)
at EditorEngine._tick (D:\Program Files\CocosCreator\resources\app.asar\editor\page\scene-utils\editor-engine\index.js:1:5622)