Fate of Karabor quest bug

[Xillian21]

I wanted to do the "Fate of Karabor" quest in Draenor but it just did not work. I drank the potion what Velen gave me but the whole thing is buggy and I cannot continue the storyline in Shadowmoon Valley in Draenor.

 

[Sotine]

Hello.
What's your character's nickname?