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12-23-18, 09:23 AM   #4
Kanegasi
A Molten Giant
 
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Join Date: Apr 2007
Posts: 666
I would like to share my experience with another addon that caused this issue. Blizzard changed how GetAchievementCriteriaInfo() returns data, a third argument is needed to get hidden criteria. The dumb part is that it throws an error if there’s no “unhidden” criteria or any criteria at all at that index and stops any processing in that thread.

The addon I experienced this with was Wowhead_Looter. They had a function that recorded achievement info hooked to the complete quest function. When you tried to complete a quest, the achievement info thread errored, preventing the quest complete.
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