Fatal Error: EXCEPTION_ACCESS_VIOLATION_READ / 0x6969b53c - 7054415606

Fatal Error: EXCEPTION_ACCESS_VIOLATION_READ / 0x6969b53c - 7054415606 : crashes/20eb93c3-ea41-42d0-08f8-86749335e3b8

Got this error while trying to add a component to a map (Vmap.) in hammer. 

I got this when adding a component to an object in a scene. The `.cs` file got created fine, but the scene was not saved. I could re-add the component after relaunching S&box.