I can only assume this has something to do with replacing the default right click menu on the quest log, but I've tried and frankly can't find any other means of doing it. In fact MANY other addons have nearly the exact same code for dropdown menus that I employed here... There was a "NoTaint_DropdownMenu" addon someone released years ago, but it doesn't seem to have been maintained in many years. I tried it, but I couldn't get it to function.

All that said I haven't encountered a single problem related to this error. All seems to work perfectly fine in Jamba and everywhere else in my testing...

I installed BugGrabber and played for many hours. I have a slew of addons so while I haven't seen this particular error from Jamba Quest pop up, I get a boatload of this type of error from various addons going into and out of battlegrounds, joining raids, etc...

I haven't seen any errors or problems with this or any odd behavior anywhere else in the game. Has this caused any issue for you?