I am currently working on a world map mod using bare geomod on a steam version of M2. So far I have added the mayans and the apachean from the americas expansion and the aztecs(altered), england and france from the main game. If playing as the mayans or apachean and attacking a faction from the main game(England, France, Aztecs) the game works fine. However if the mayans or apachean get attacked (except in siege counterattacks) the game immediately crashes before starting the screen where u can decide to manage or automanage the battle.
I have attached the last lines of the systemlog file, however I could not find any similarities in the entries. Sometimes the last entries are "minor_lose.bik" and sometimes the system_log ends with Army_Family_Trigger fired.