I had a crash exactly when Balbala, the Traitor and I can't ascend the traitor's passage

Hello,
I'm in the second act 2 (lv 59) and I killed Balbala the traitor and got a crash. When I reconnected I did get the loot. But I still have a quest "Ascent To Power" that say "search traitor's passage" but it seems that I can't complete it. I already killed Balbala again and it doesn't seem to work. I also searched every passage I could and found nothing. I also already found Halani gates.

Is there something I missed or is that a bug?