I'm getting this error occasionally.

As seen in the chat, I just accepted "Hamuul Runetotem" and "Mura Runetotem". I'm not sure which of these triggered the error or if it's tied to a specific quest at all.

The quests can be found on NPC "Tonga Runetotem" in "The Crossroads".

Had the same error today (current master branch). It appeared when I changed / selected some quests to track (using EQL3). I could get it to pop two times in a row by randomly changing quests to track and untrack. I was not able to reliable reproduce the error though.

@AeroScripts Keep this in mind as well when porting the tracker to Classic