Editor crashes only in versions where SceneManager exists.

Repro steps:
1. Add some project to perforce (version control system)
2. Add a scene and submit
3. Add GameObject to the scene on remote machine and submit
4. Add GameObject to the scene on local machine and submit
==>
Conflict appears
5. Right-click on the scene in Version Control window and choose "Resolve Conflicts"
6. Choose "Semantic Merge"
7. After merging the scene will be reloaded automatically (sometimes the confirmation dialog appears , then press "Reload")
==>
Editor crashes

According to the callstack this is the SceneManager problem (maybe this class just doesn't expect scene changing in the backgorund) but I cannot repro this without using perforce