Join one of the multiplayer servers of the conflict mode. (Everon or Arland, happens on both).
Tested on the POWERBITSGAMING server and the one with the "!" in the name. Those are usually the ones that are nearly full.
Play some time until the crash happens. Happens again after about 15-30 min. Sometimes later, somtimes earlier (can run stable for hours, but then crashes with the same exception).
Singleplayer conflict map works fine. It's gamebreaking. The round often starts new after the crash happened, so it seems not just client side.