1.2的项目升级到1.3.3报错。场景直接被破坏！

@ckisking 写道：

报错信息：
Cannot read property '_prefab' of null
at serializeNode (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:2402)
at _enumerateObject (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:2750)
at _serializeObj (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:4491)
at _serializeField (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:3772)
at _enumerateObject (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:2642)
at _serializePrimitiveObj (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:4024)
at _serializeObj (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:4789)
at _serializeField (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:3772)
at enumerateByFireClass (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:2279)
at serializeNode (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/share/engine-extends/serialize.js:1:2525)

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