Quest The bandit Lord (deal with the bandit) bug

A friend and i were planing on helping Alira but when we arive at kraityn camps i couldn't vote to kill or help him, i tried to leave the zone. the boss sudenly agro my friend so i tried to ruch to help him to kill the boss but the door of the bandit camp was close and now i dont have kraityn's amulet and he will not respawn even when i close the game or change character.