https://pastebin.com/sEcwgGYa

it seems like the werewolves from This mod can be assimilated but don't have a valid form, so the game crashes... well, in this case, I have Neurina to catch the exception before the game goes kaboom... but still, it usually crashes

alright, seems like they CANNOT be assimilated by the assimilation liquid - however, it must have been something else... and this seems to be the cause

also, it's both beast and survivalist werewolves