I'm not 100 percent sure what happened and I can't reproduce it since opening the map will always crash the game now. This is what I did before the issue occured
1. Create a fleet with one ship
2. allow the flagship to be destroyed
3. admin warp out the sector while it is still overheating
4. Order the fleet to move to your sector# delete all fleets if you have any
5. Delete the fleet once the overheating ship has arrived
6.Attempt to access# open the map and get a nullpointer
create 1 fleet and check your map again, should be fine the mapn.