Message: Interface\AddOns\Bagnon\common\components\item.lua:479: Usage: IsContainerItemAnUpgrade(index, slot)
Time: 04/27/17 03:28:07
Count: 160
Stack: [C]: in function IsContainerItemAnUpgrade' Interface\AddOns\Bagnon\common\components\item.lua:479: in function IsUpgrade'
Interface\AddOns\Bagnon\common\components\item.lua:305: in function UpdateUpgradeIcon' Interface\AddOns\Bagnon\common\components\item.lua:248: in function ?'
Interface\AddOns\Bagnon\common\components\item.lua:509: in function <Interface\AddOns\Bagnon\common\components\item.lua:507>

Locals: (*temporary) = "vault"
(*temporary) = 5

May I ask why this was closed with no comment?

Basically, its fixed

The error tells me this is a void storage item. The code in question completely changed meanwhile, and this issue should not happen again.