I personally wouldn't recommend mixing anything FU related with FeralHeart. I would remove the textures and reinstall the default, then see if you still crash when entering any other maps. If you do end up crashing, take a look at the FH.log, located in the main FeralHeart folder, and see what it says in there. That might give you an idea of what's gone wrong.
Or, you can always do the ultimate fix: reinstall the game, then reinstall any mods you have. It's always a good idea to have a copy of your FH before installing any new mods in case any aren't compatible, then you won't have to go through the trouble of reinstalling everything if you can't find the issue.