Reproducible Bug (instant Crash to Desktop)

I leveled up most of my party to level 4 in the Whispering Depths. My player character and Gale can be leveled up however I want them to. Wyll on the other hand crashes the whole game when I choose the Mage initiate Warlock Feat. However, if I leave the Whispering Depths I can level him up just fine. I've crashed my game half a dozen times checking and it seems to be fine if I either leave the Whispering Depths or pick another Feat.

Edit 1: Picking the Mage initiate Warlock Feat and going back into the Whispering Depths also crashes to desktop.