To reproduce from the attached save file:

1. Select city (Ramuest).
2. Select Markim and Rilis.
3. Right click on Irane (attack).
4. Markim+Rilis will exit the city and attack Irane.
5. After the battle, click Done and the game crashes.

Background: Immediately prior, Markim+Irane attacked and conquered the city (Ramuest), owned by Irane/Tarth.  There were 2 NPCs in the city prior to conquering:

1. The "AI Fighter" was killed.
2. "Bitaespl" was married to Irane but was not in the battle and appears to still be present in the city.  In the crash file, notice that his post-conquer tooltip shows that he's a "Level 1 Sovereign" but no longer shows "King of Tarth".

Note: If you instead move Markim+Rilis to 1 square outside the city, then right click on Irane (attack), there is no crash after the battle is done.  In this case, "Bitaespl" disappears from the city after the battle with Irane.

Dump zip file (contains dxdiag, save file, and dump zipfile): http://dl.dropbox.com/u/8067364/Beta2%20-%20CRASH%20-%20Markim%2BRilis%20attack%20Irane%20after%20conquering%20city%20100613%20200600.zip

(The dump.err folder was empty - known issue)

Edit: Zip file had wrong dxdiag - fixed.