It's likely these issues are all tied together. If there's a bug in a unit (which at present is very likely) it can crash the game both if the unit spawns in the game or if it's selected in the armory. Since the most recent DLC there have been multiple crashes and I'm still trying to find them. If you remember what divisions were in your game when it crashed, it'll help me find those problems.

There's a second issue involving aircraft resupply that Eugen created by changing supply costs from int to float. I've mostly fixed it, but it can cause a crash when planes return to base. I'm not sure I implemented the workaround for all planes.

Thanks for your hardworking,
But the issue could be complicated, because almost every division of PACT which I played seem to get the same crash, I don't know which unit caused this, probably even a NATO unit could cause this error like a aircraft spawned by the AI enemy in NATO. So I'm not even sure if was PACT or NATO that caused crashes.

As an update. I'm getting this a bit more lately. My current hypothesis is that I've introduced a bug in an infantry depiction since I experience the crash when I'm zoomed in.