Got this error randomly:

1x [ADDON_ACTION_BLOCKED] AddOn 'Mapster' tried to call the protected function 'MultiBarRight:SetScaleBase()'.
[string "@Interface/AddOns/!BugGrabber/BugGrabber.lua"]:480: in function <Interface/AddOns/!BugGrabber/BugGrabber.lua:480>
[string "=[C]"]: in function SetScaleBase' [string "@Interface/FrameXML/EditModeSystemTemplates.lua"]:38: in function SetScale'
[string "@Interface/FrameXML/EditModeManager.lua"]:585: in function UpdateRightActionBarPositions' [string "@Interface/FrameXML/EditModeManager.lua"]:557: in function UpdateActionBarLayout'
[string "@Interface/FrameXML/EditModeSystemTemplates.lua"]:655: in function UpdateGridLayout' [string "@Interface/FrameXML/ActionButton.lua"]:373: in function UpdateAction'
[string "@Interface/FrameXML/ActionButton.lua"]:803: in function `OnEvent'
[string "@Interface/FrameXML/ActionButton.lua"]:216: in function <Interface/FrameXML/ActionButton.lua:213>