I'm not sure if this particular crash has already been reported. There are so many crash reports that it's possible it's already been fixed for the next patch. However the reason I'm reporting this one is because on my current save game it reoccurs every few turns making my save game virtually unplayable. I'm gonna attach the autosave as well which if you press the end turn button a couple times the game should crash. Last time it took me four presses.
Also I'd like to add a little something on the side as well.
I use a custom faction when I'm playing but I've noticed when I start a new game it doesn't save all the faction colors that I selected for my faction. Particularly the one for the main color of your buildings (edit: they are called 'Primary Color' and 'Clothing Color 2' Also 'Map Color' doesn't show the correct color in the little box.) This problem occurs after I've quit the game, then if I try to go back in and start a new game then select my faction it doesn't use all the faction colors I've selected. The work around for this has been to go back into the faction creator and edit the colors once again then save the faction and start a new game. But as soon as I quit the game the faction colors are once again reset.