Description: After a space combat (it didn't get past the end of the combat to view results) with a couple fleets on a star system, I'd get a 'working' spinning blue wheel, when I'd alt + tab out, there'd be a popup that says something happened to send to the devs and clicking 'ok' would close the game.  

Reproducibility: 5/5

I loaded an earlier autosave and continued playing, but as soon as the AI would attack the same system, it would occur again.  Tried to load from an even earlier autosave and still had it happen again.  

Attachments: I've included the most recent diagnostics below.

Diagnostics - 2020'01'21 @0017'35''.html