Problem: CTD on end of turn, usually during another faction's turn
Cause: Most likely cause is the script not being activated each time you play, resulting in a cloned character for another faction popping up and causing errors.
First,
To watch what causes the CTD you can do the following;
1) Edit Preferences.txt
change FOG_OF_WAR:TRUE to FOG_OF_WAR:FALSE (so you see the whole map)
change LABEL_CHARACTERS:FALSE to LABEL_CHARACTERS:TRUE
change CAMPAIGN_MAP_CAMERA:SKIP_AI_FACTIONS to CAMPAIGN_MAP_CAMERA:FOLLOW_AI_FACTIONS
2) Launch the game and load your save. Press end turn - you should see in detail all the characters and units moving - it can take a long time and you need to stay awake to see what was last moving when the CTD happens.
Originally Posted by -FrOzeN-
Use the move_character "name" x,y command (get the xy by holding the cursor over the desired position and writing show_cursorstat in the console) and finally using auto_win will defeat him (and the CTD)
If the game crashes when you attack him your sole choice is to move him to a place where he can not interact with other characters (the African desert or a lone island in Greece for example)