工程是2.0.5开发的，用2.0.9p1打开是为了出百度小游戏。昨天出还好好的，今天发现label组件狂报错。在一个空预制随便加个label就可以报错，使用系统默认字体的勾去掉就不报错
请问怎么回事？？
2019-04-12T04:18:18.990Z - error: TypeError: Cannot read property ‘context’ of null
at Object._updateProperties (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\renderer\utils\label\ttf.js:104:41)
at Object.updateRenderData (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\renderer\utils\label\ttf.js:63:22)
at RenderFlow._proto._updateRenderData (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:89:29)
at RenderFlow._proto._children (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:119:38)
at RenderFlow._proto._children (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:119:38)
at Function.RenderFlow.visit (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:208:42)
at Object.render (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\renderer\index.js:126:32)
at cc.Director.mainLoop.CC_EDITOR._purgeDirectorInNextLoop [as mainLoop] (D:\CocosCreator209\resources\engine\bin.cache\dev\cocos2d\core\CCDirector.js:441:26)
at EditorEngine.tickInEditMode (D:\CocosCreator209\resources\app.asar\editor\page\scene-utils\editor-engine\index.js:1:2647)
at EditorEngine._tick (D:\CocosCreator209\resources\app.asar\editor\page\scene-utils\editor-engine\index.js:1:5675)