I am aware of that one, and tbh, i don't know what it is. and neither does lazy, this can happen at any time, you can play for 2 hours, 2 minutes or even 2 seconds before that crash appears. and i think i have reported it to alex but forgot about it and reported it again like 3 or 4 times would be cool if he could shine some light on the problem in here.
Well, seeing as it happens on the title screen and it seems to be related to fighter AI I would look at these:
excalibur_corv
helia_corv
azgard_wing
morgiana_wing
as they are the only Valkyrian fighters that will appear on the start screen according to your title_screen_variants.csv. In fact, should the excalibur_corv and the helia_corv have '_wing' after it? I know there are issues when you try to field a single fighter instead of a wing. I wonder if wrong title_screen_variants can cause crashes elsewhere?
Also, the Ancord only has a wing size of 1. I seem to have a vague recollection this can cause errors? Hmmm I'm probably mis-remembering something
Regardless, the Valkyrian faction makes a triumphant return to Exerelin in the next version
I will mark the Valkyrian mod with an asterix noting the possible NullPointerException as I have no doubt that I will get Exerelin bug reports about it