And apparently I'm having the same bug with Adrian trying to leave party. It started to occur after my reputation score went up to 20 (I'm going through Friendship path, Likes variable is set to 1, Talks is at 45 and Friendship is at 1). Talks stopped after that bug started to pop up, but I'm not sure if Friendship path involves further dialogues (the last one was "Once this is over, assuming we live through it... hmm.").
I used SK to drop my reputation to 16 and deleted Reputation variable, but that didn't help, he's still attempting to leave on occasion.