40x Keystone-Companion/ui/main.lua:612: Usage: local className, classFilename, classID = UnitClass(unit)
[string "=[C]"]: in function UnitClass' [string "@Keystone-Companion/ui/main.lua"]:612: in function RerenderPlayerRow'
[string "@Keystone-Companion/ui/main.lua"]:691: in function `Rerender'
[string "@Keystone-Companion/main.lua"]:101: in function <Keystone-Companion/main.lua:49>

Locals:
(*temporary) = nil

This was fixed in this Branch already will do a new release soon.
Thanks for the Report :)