was trying to combine a scrap of black dragonscales and a petrified orb when this error happened. A box showed up on the screen saying BetterBags has been blocked from an action only available to the blizzard ui. you can disable this addon and reload the UI.

1x [ADDON_ACTION_FORBIDDEN] AddOn 'BetterBags' tried to call the protected function 'UNKNOWN()'.
[string "@!BugGrabber/BugGrabber.lua"]:481: in function <!BugGrabber/BugGrabber.lua:481>
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: in function UseContainerItem' [string "@FrameXML/ContainerFrame.lua"]:1424: in function <FrameXML/ContainerFrame.lua:1333> [string "=[C]"]: in function ContainerFrameItemButton_OnClick'
[string "@FrameXML/ContainerFrame.lua"]:1476: in function <FrameXML/ContainerFrame.lua:1463>

Locals:
_ = Frame {
RegisterEvent = defined @!BugGrabber/BugGrabber.lua:487
0 =
UnregisterEvent = defined @!BugGrabber/BugGrabber.lua:487
SetScript = defined @!BugGrabber/BugGrabber.lua:487
}
event = "ADDON_ACTION_FORBIDDEN"
events =

Do you have any information on what you were doing at the time? Were you in combat? Also, did you use the bag button to open the bag, i.e. clicking on the blizzard bag button?

Also, do you have the "Hide bag button" option checked that hides the Blizzard bag button?

I just pushed a new file that possibly fixes this. Let me know if you can reproduce this!

I was able to combine the items and no longer got an error message.