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I was playing a mortal empires campaign as the Dreadfleet and didn't have any problems until I tried to get the short campaign victory by occupying the Pirates of Sartosa's last settlement. Their final army was garrisoned there as well. After I selected occupy in the post battle screen, the game crashed. I reloaded a save, tried again, and had the same issue. I tried occupying with a different army or razing the city and neither worked. Sacking the city didn't cause the game to crash. I updated graphics drivers (nvidia) and tried using both versions of directx but that didn't fix the problem either. I finished the rest of the long campaign, came back to the final city, and tried to occupy it again and still had the same problem.
I attached both save files and all logs/dumps from the final crash. Running v 1.5.0 build 8774.1520175