When hover on concentration got this stack trace :

14x CraftSim/Modules/ConcentrationTracker/UI.lua:181: bad argument #1 to 'pairs' (table expected, got nil)
[string "=[C]"]: in function pairs' [string "@CraftSim/Modules/ConcentrationTracker/UI.lua"]:181: in function UpdateTooltipFrame'
[string "@CraftSim/Modules/ConcentrationTracker/UI.lua"]:53: in function `frameUpdateCallback'
[string "@CraftSim/Libs/GGUI/GGUI.lua"]:224: in function <CraftSim/Libs/GGUI/GGUI.lua:202>
[string "@CraftSim/Libs/GGUI/GGUI.lua"]:243: in function <CraftSim/Libs/GGUI/GGUI.lua:242>

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