To reproduce:
1. Create a new project.
2. Create Empty "GameObject" with an empty "GameObject" child.
3. Make a prefab of this GameObject with child.
4. Select a prefab, and add component "Rect Transform"
5. Undo this action.

Expected result: Action is undone.
Actual result: Unity Editor crashes.

Reproducible with: 5.3.7p1, 5.4.3p1, 5.5.0f3, 5.6.0b5
Not reproducible: 5.2.4f1