Instant Saba CTD

[Kugutsu]

Saba have just declared war on me for the first time. Now whenever I attack them or they attack me, I get a CTD. Its totally repeatable, as it has happened 6 times in a row now. It crashes the minute you try to attack, before the pre-battle screen pops up. I tried with all the Saba armies in sight:







The only thing the three have in common is pantopodoi, but I have faced those many times with the Seleukids to no effect.

I have also attacked the Seleukids, Ptolies and Epirots to see if that did anything, and there was no crash. It seems to only happen with the Saba.
Is there anything I can do to find out why this is happening?
And if its not fixable, is there any way to stop them ever attacking me? (obviously I can not attack them, but it crashes both ways).