5.1.1p3 crashing when editing a prefab

Hello, Is anyone else having 5.1.1p3 crash when they edit a prefab? It recently started, so I reinstalled unity and reimported all the assets of the project. But it’s still crashing. All the log says where it crashes is

Refresh: detecting if any assets need to be imported or removed … Refresh: elapses 0.139991 seconds (Nothing changed)
Crash!!!

But that’s all.

BoxCollider2D? this is a bug