infotext/infotip.lua:54: bad argument #1 to 'unpack' (table expected, got nil)

[Pahn1988]

[string "=[C]"]: ?
[string "@LUI/modules/infotext/infotip.lua"]:54: in function SetClassIcon' [string "@LUI/modules/infotext/friends.lua"]:281: in function DisplayBNFriends'
[string "@LUI/modules/infotext/friends.lua"]:568: in function `OnEnter'
[string "@LUI/modules/InfoText/infotext.lua"]:268: in function <LUI/modules/InfoText/infotext.lua:264>

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

got that error with alpha 11