bug: stuck at the end of act 4

Hello,

there is a bug,

i can't finish the act 4, i killed talakai, but there is nothjing that happen after, i'm in the boss room, the map says there is 3 pnj in the room, but it s empty.

the qsuest tells me to find talakai, but i already killed him.

Plz fix that, i'm stuck and i can't go the to endgame.