Only seen this happen twice on two different toon, both while waiting to pull the world boss in Zeth Mortis while in raid. Just happens on its own, I don't believe I did anything to cause it.

23x [ADDON_ACTION_FORBIDDEN] AddOn 'ItemLevelDisplay' tried to call the protected function 'SpellStopCasting()'.
[string "@!BugGrabber\BugGrabber.lua"]:519: in function <!BugGrabber\BugGrabber.lua:519>
[string "=[C]"]: in function SpellStopCasting' [string "@Blizzard_RuneforgeUI\Blizzard_RuneforgeCraftingFrame.lua"]:188: in function <...zard_RuneforgeUI\Blizzard_RuneforgeCraftingFrame.lua:169> [string "=(tail call)"]: ? [string "=[C]"]: ? [string "@SharedXML\CallbackRegistry.lua"]:118: in function <SharedXML\CallbackRegistry.lua:117> [string "=[C]"]: ? [string "@SharedXML\CallbackRegistry.lua"]:121: in function TriggerEvent'
[string "@Blizzard_RuneforgeUI\Blizzard_RuneforgeItemSlot.lua"]:225: in function SetItem' [string "@Blizzard_RuneforgeUI\Blizzard_RuneforgeCraftingFrame.lua"]:132: in function SetItem'
[string "@Blizzard_RuneforgeUI\Blizzard_RuneforgeCraftingFrame.lua"]:21: in function `onClickFunc'
[string "@FrameXML\EquipmentFlyout.lua"]:543: in function <FrameXML\EquipmentFlyout.lua:540>