Message: Interface\AddOns\Blizzard_InspectUI\Localization.lua:3: attempt to index global 'SpecializationSpecName' (a nil value)
Time: Fri Sep 6 17:23:01 2019
Count: 1
Stack: Interface\AddOns\Blizzard_InspectUI\Localization.lua:3: attempt to index global 'SpecializationSpecName' (a nil value)
Interface\AddOns\Blizzard_InspectUI\Localization.lua:3: in main chunk
[C]: in function LoadAddOn' Interface\FrameXML\UIParent.lua:353: in function UIParentLoadAddOn'
Interface\FrameXML\UIParent.lua:388: in function InspectFrame_LoadUI' Interface\FrameXML\UIParent.lua:635: in function InspectUnit'
Interface\FrameXML\UnitPopup.lua:1691: in function func' Interface\FrameXML\UIDropDownMenu.lua:958: in function UIDropDownMenuButton_OnClick'
[string ":OnClick"]:1: in function <[string ":OnClick"]:1>

Locals: (*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index global 'SpecializationSpecName' (a nil value)"

This isn't a ShestakUI bug.