I've been working on a Race mod, and I've been having this issue when I tried testing it. The crash is inconsistent; one time the game crashes when I click on the Race's Icon, another time it happens upon getting past the initial loading screen. I am using Unstable version to test, so that might be part of the problem. Upon closer inspection, it might have something to do with the character creation screen.
Modified the body colors (Trying to see if I could different basic colors for the sprite- Which were replaced with the basic dyable colors when that didn't work), removed the hair colors and made them limited to one hair style. Aside from that, not much else. EDIT: I just noticed the hair color option for the character gen screen wasn't removed... EDIT 2: Problem solved. Turns out the hair color option was the problem.