I am playign as port and fatamids are attacking me in Murrakas (the most southwest city in modern day Morocco) and after they bust open the gates I get no "enemy has broken gates warning" and then as they storm in 15-20 seconds later the game crashes. Not sure if it's related to the gate being busted open or not. It has crashed 4 times now every time. I can't auto resolve the battle because I lose.

How do I fix this battle crash?