Custom structure in blueprint corrupts Project

Adding a custom Struct appears to crash the user project (possibly circular reference issue )

1. Down load attached project
2. Open project
3. Try to open map (DO NOTopen struct first)
4. Notice Crash
5. Open Project back up
6. Open Struct
7. Open Map
8. Notice no crash

The nightmare of deleting an empty folder (auto saving)

Custom structure in blueprint corrupts Project