Warlock's succubus

The Problem:
It is about Succubus quest line for warlock. I'm blood elf, got first quest in line ( done it , just need to talk with guy in undercity). And i'm not available to get next quest in line Devourer of Souls. Now this guy can't be clicked by me and i cant get next quest. NPC is No task can be given to me. I got freezed in quest completion( got reward ).

How it should work:
I should be able to get next quest from the chain ( blood elf 70 lvl). Maybe reason by race.


How to reproduce:
Other warlocks can do this quest in same time, but i cant. Can't explain how to reproduce

Can Confirm. 3 weeks later, this issue is occuring with my lvl 70 Blood Elf Warlock

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