Pre-battle crash

Hello. I've been having lot of crashes recently, 273 turns into a campaign i think. They occur at various points but this one i attached is the one that is the most troubling case. Basically, battles which involve multiple decently-sized armies (5000+ men in total) are extremely unstable, sieges in particular. In this case i can't even get the battle to start (it's an enemy assault on Caralis), while usually in any siege battle the game crashes during or after the siege, or if it's an open field battle which includes a reinforcement army from nearby city. My rig is usually fine for running M2TW mods but i understand EB2 is extremely demanding so in large battles i lower all graphics to minimum, wait for 20+ seconds in the post-battle screen and use LAA. This managed to fix part of the crashes, but not all of them. I also have a large number of saved games, is it possible that they're affecting the stability of the mod somehow? Many thanks in advance.

P.S. i'm playing on 2.2b since i started the game long time ago, restarted it recently, so starting a new game is an option i'd very much like to avoid.

Not much in that log unfortunately. Can you post one with trace enabled?

Sorry, but if you're playing 2.2b, it could be absolutely anything amongst the huge number of things we've fixed since then.