Been having this issue for well over a year, on multiple computers. Basically, switching factions while in a custom lobby where I am the host (or sometimes even just hovering over commander portraits) will cause a bugsplat.
Repo steps: Hard to define because it doesn't happen consistently. Generally, I'll start an empty custom game, put an expert Wehr AI on team 2, then switch my faction. I just had it happen when switching from Russian to British, the instant the british symbol appeared the bugsplat occurred. It seems to be related to accessing the commander tooltips, as I've most often had it triggered by simply mousing over three commanders I have equipped.
I've tried doing a clean install to resolve this problem with no improvement. Also just tried verifying the steam cache.
Windows 10 (Up to date)
GTX 780 Ti
Latest Nvidia drivers. Not a driver issue, this has been happening for over a year with numerous drivers.