Steps to reproduce:
1. Open user attached
2. Open the ShootingStandoff scene.
3. Select the DEST object in the scene.
4. Click revert
- Editor crashes at this point

Expected result: Editor should not crash after clicking Revert prefab

Reproduced in: 2018.3.0a8, 2018.2.0f2, 2018.2.0b1

========== OUTPUTTING STACK TRACE ==================
0x0000000140B3CCA6 (Unity) Rigidbody::WakeUp
0x0000000140B04C6D (Unity) Unity::Joint::Cleanup
0x00000001405A63EF (Unity) GameObject::ActivateAwakeRecursivelyInternal
0x00000001405A61C2 (Unity) GameObject::ActivateAwakeRecursivelyInternal
0x00000001405A61C2 (Unity) GameObject::ActivateAwakeRecursivelyInternal\
...