I have loaded your saved game using our internal build. I hit the turn button after it finishes loading, and I do not get any crash. I've tried hitting turn a few more times too, but am unable to get a crash.
Are there any other steps I should take after loading your save, or does just hitting the Turn button after loading it crash it for you?
In your save, Varga's faction is already destroyed. Do you still have a save from before he attacked you? If so, please submit that and we can try to see if that reproduces the crash.
When he attacked you, did you auto-resolve the battle or did you fight it out on the tactical screen?