WoW throws this LUA when opening Atlasloot and checking loot. It triggers when hovering the mouse over items and even when opening Atlasloot:

52x AddOnSkins/SkinsAtlasLoot.lua:14: bad argument #1 to 'unpack' (table expected, got nil)
[string "=[C]"]: in function unpack'
[string "@AddOnSkins/SkinsAtlasLoot.lua"]:14: in function <AddOnSkins/SkinsAtlasLoot.lua:5>
[string "=[C]"]: in function Show'
[string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:391: in function <SharedXML/Tooltip/TooltipDataHandler.lua:339>
[string "=[C]"]: in function securecallfunction'
[string "@SharedXML/Tooltip/TooltipDataHandler.lua"]:336: in function <SharedXML/Tooltip/TooltipDataHandler.lua:335>
[string "=(tail call)"]: ?
[string "@AtlasLoot/Button/Item_type.lua"]:142: in function OnEnter'
[string "@AtlasLoot/Button/Button.lua"]:77: in function <AtlasLoot/Button/Button.lua:70>

Locals:
(temporary) = nil
(temporary) = "table expected, got nil"