正常使用过程中，cocos突然卡死，报错为：TypeError: Cannot read property '_prefab' of null at cc_Node._onBatchCreated (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCNode.js:2059:32) at cc_Node._onBatchCreated (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCNode.js:2068:13) at cc_Node._onBatchCreated (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCNode.js:2068:13) at cc_Node._onBatchCreated (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCNode.js:2068:13) at cc_Node._onBatchCreated (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCNode.js:2068:13) at cc_Node._onBatchCreated (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCNode.js:2068:13) at cc_Scene._onBatchCreated (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCNode.js:2068:13) at cc_Scene._load (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCScene.js:101:12) at Object.runSceneImmediate (C:\ProgramData\cocos\editors\Creator\2.4.8\resources\engine\bin\.cache\dev\cocos2d\core\CCDirector.js:432:11) at C:\ProgramData\cocos\editors\Creator\2.4.8\resources\app.asar\editor\page\scene-utils\utils\scene.ccc:1:4051
结果：cocos无法关闭，场景无法打开，预制体无法打开，重启无效（重启后依然卡死）
