Can't go to the lich king battle 7.3.5 100x

[KronosSchyte]

Already killed all the bosses but i can't go to lich king fight

http://prntscr.com/lokkhk

[VúSale]

Bug tracker:
Legion: https://forum.wowcircle.com/forumdisplay.php?f=1505


Bug-report form:
1) Bugged spell/talent/quest, etc. with a http://wowroad.info/ link (necessary).
2) What exactly works incorrect or does not work.
3) How it should work (quote from http://wowroad.info/).
4) Verification date, realm and logon.
5) When this issue occured (how long)?
6) Issue priority (your opinion), scale from 1 to 10.
7) Screenshots, video, that confirm this issue (not necessary).
8) Way of issue repro, when the bug is not constant
9) 1 topic - 1 bug report.
10) In quest bug reports point out NPC or GO which you interacted with links to http://wowroad.info/. (necessary)