[votan]

Originally Posted by QuadroTony and how to fix?

function FilterIt.GetSlotData(_iBagId, _iSlotId)
    local bIsBagSlotValid = false
 
    if (type(_iBagId) == "number") and(type(_iSlotId) == "number") then
        bIsBagSlotValid = _iBagId ~= BAG_BUYBACK
    end
 
    local slotData = nil
    if bIsBagSlotValid then
        slotData = SHARED_INVENTORY:GenerateSingleSlotData(_iBagId, _iSlotId)
    end
    return slotData or { stackCount = 0 }
end

without much testing, but works.