TypeError: Cannot read property '_original' of null

Creator 2.x
#1

打开prefab文件时编辑器报错，编辑器版本为：creator 2.4.9 ，还请引擎组大神空闲时帮忙看下，具体堆栈日志如下：
TypeError: Cannot read property ‘_original’ of null
at SimpleSpriteAssembler.packToDynamicAtlas (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\assembler-2d.js:175:16)
at SimpleSpriteAssembler.updateRenderData (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\webgl\assemblers\sprite\2d\simple.js:33:10)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:71:19)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:63:14)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:47:14)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:130:26)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:96:14)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:81:14)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:63:14)
at RenderFlow. (D:\CocosDashboard_1.1.1\resources.editors\Creator\2.4.9\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:47:14)

#2

预制体下没有引用到资源 多点几次预制体就会不断报这个错了。 应该可以不用管