Error 333 need help plz

[Tomandjerry]

user:/AddOns/TamrielTradeCentre/TamrielTradeCentrePrice.lua:333: attempt to index a nil value
stack traceback:
user:/AddOns/TamrielTradeCentre/TamrielTradeCentrePrice.lua:333: in function 'OverWriteInventoryShowContextMenuHandler'
user:/AddOns/TamrielTradeCentre/TamrielTradeCentrePrice.lua:408: in function 'TamrielTradeCentrePrice:Init'
|caaaaaa<Locals> self = [table:1]{} </Locals>|r
user:/AddOns/TamrielTradeCentre/TamrielTradeCentre.lua:647: in function 'TamrielTradeCentre:Init'
|caaaaaa<Locals> self = [table:2]{PlayerID = "@Dokimastikos", IsDebug = F, AddonName = "TamrielTradeCentre"}, clientCulture = "en", default = [table:3]{ActualVersion = 10}, savedVars = [table:4]{}, serverRegion = "EU", FlagIsFirstExecute = user:/AddOns/TamrielTradeCentre/TamrielTradeCentre.lua:608 </Locals>|r
user:/AddOns/TamrielTradeCentre/TamrielTradeCentre.lua:657: in function 'OnAddOnLoaded'
|caaaaaa<Locals> eventCode = 65536, addOnName = "TamrielTradeCentre" </Locals>|r