I am not sure if this has been posted. I did a search and didn't find anything.

Steps to Reproduce

1. Have full quest log
2. Go to an NPC that has a new quest as well as a completed quest.
   Specifically I was doing the Wharfmaster Dizzywig in Ratchet
3. Click the NPC

Expected Result
Completed quest is done first

Actual Result
It tries to get the new quest and says quest log is full and then closes the window.
You are unable to complete the quest and can't click anything because it closes too fast.

This sounds like an error from another addon. Questie doesn't automatically accept/finish quest.

Someone was having this before and it turned out to be classic codex