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Fixed in Unity 2017.4



Found in


Issue ID




'[2017.x] Holding Undo on prefab with UI components crashes editor

Scene Management



Priority: 2Necessary for shipping a final release


Severity: 1Crash, freeze, data loss, work stops

Steps to reproduce:
1. Create new project
2. Create empty GameObject in hierarchy
3. Add "Rect Transform" component to it
4. Create empty canvas object as a child object for the newly created GameObject
5. Make GameObject a prefab
6. Delete canvas within hierarchy
7. Remove Transform component from GameObject
8. Apply prefab changes within inspector
9. Press Ctrl-Z to revert these changes

Actual result: Crash
Expected: Deleted things get recreated

Tested and reproduced on:
Windows 10
Unity 5.4.0p2, 5.5.0a6

Not reproducible on:
Unity 5.3.6p3

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