Game crashes at the end of turn/when I try to declare war

First crash that I've experienced with BNW but there seems to be no way around it. It happens every time I try to declare war on Attila (either through the leader screen or by just attacking him directly) or when I don't and just press "end turn". I tried it about ten times and it happens every time. I guess I just have to start a new game. Hopefully this is the right place to post this.