I get 4 different errors. These errors happen only if I choose the option that allows to sell low level equipment. I'm using Adibags.

1st error:
2x Scrap-5.9\Scrap.lua:150: Invalid inventory slot in GetInventorySlotInfo
Scrap-5.9\Scrap.lua:150: in function `IsLowLevel'
Scrap-5.9\Scrap.lua:74: in function `IsJunk'
Scrap-5.9\Scrap.lua:120: in function `(for generator)'
Scrap-5.9\Scrap.lua:129: in function `GetJunkValue'
Scrap_Merchant\Scrap_Merchant.lua:140: in function `OnTooltipShow'
Scrap_Merchant\Scrap_Merchant.lua:127: in function <Scrap_Merchant\Scrap_Merchant.lua:125>

2d error:
8x Scrap-5.9\Scrap.lua:150: Invalid inventory slot in GetInventorySlotInfo
AdiBags-v1.3-beta-6\AdiBags.lua:1052: in function `Filter'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:474: in function `FilterSlot'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:483: in function `DispatchItem'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:588: in function `RedispatchAllItems'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:198: in function <AdiBags\widgets\ContainerFrame.lua:192>
CallbackHandler-1.0-6:157: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:157>
<string>:"safecall Dispatcher[2]":4: in function <[string "safecall Dispatcher[2]"]:4>
<in C code>: ?
<string>:"safecall Dispatcher[2]":13: in function `?'
CallbackHandler-1.0-6:92: in function `SendMessage'
AdiBags-v1.3-beta-6\AdiBags.lua:523: in function `?'
CallbackHandler-1.0-6:147: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:147>
...:
<in C code>: in function `CloseMerchant'
Interface\FrameXML\MerchantFrame.lua:54: in function <Interface\FrameXML\MerchantFrame.lua:53>:
<in C code>: in function `Hide'
Interface\FrameXML\UIParent.lua:1453: in function `SetUIPanel':
Interface\FrameXML\UIParent.lua:1529: in function `HideUIPanel':
Interface\FrameXML\UIParent.lua:1204: in function <Interface\FrameXML\UIParent.lua:1196>:
<in C code>: in function `SetAttribute'
Interface\FrameXML\UIParent.lua:1896: in function `HideUIPanel':
Interface\FrameXML\UIParent.lua:1900: in function `HideParentPanel':
<string>:"*:OnClick":1: in function <[string "*:OnClick"]:1>

3d error:
3x Scrap-5.9\Scrap.lua:150: Invalid inventory slot in GetInventorySlotInfo
Scrap-5.9\Scrap.lua:150: in function `IsLowLevel'
Scrap-5.9\Scrap.lua:74: in function `IsJunk'
Scrap-5.9\Scrap.lua:120: in function `(for generator)'
Scrap-5.9\Scrap.lua:129: in function `GetJunkValue'
Scrap_Merchant\Scrap_Merchant.lua:176: in function `UpdateButtonState'
Scrap_Merchant\Scrap_Merchant.lua:101: in function `?'
Scrap-5.9\Scrap.lua:36: in function <Scrap\Scrap.lua:36

4th error:
6x Scrap-5.9\Scrap.lua:150: Invalid inventory slot in GetInventorySlotInfo
AdiBags-v1.3-beta-6\AdiBags.lua:1052: in function `Filter'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:474: in function `FilterSlot'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:483: in function `DispatchItem'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:588: in function `RedispatchAllItems'
AdiBags-v1.3-beta-6\widgets\ContainerFrame.lua:198: in function <AdiBags\widgets\ContainerFrame.lua:192>
CallbackHandler-1.0-6:157: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:157>
<string>:"safecall Dispatcher[2]":4: in function <[string "safecall Dispatcher[2]"]:4>
<in C code>: ?
<string>:"safecall Dispatcher[2]":13: in function `?'
CallbackHandler-1.0-6:92: in function `SendMessage'
AdiBags-v1.3-beta-6\AdiBags.lua:523: in function `?'
CallbackHandler-1.0-6:147: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:147>
<string>:"safecall Dispatcher[1]":4: in function <[string "safecall Dispatcher[1]"]:4>
<in C code>: ?
<string>:"safecall Dispatcher[1]":13: in function `?'
CallbackHandler-1.0-6:92: in function `Fire'
AceEvent-3.0-3 (TomTom):120: in function <...ace\AddOns\TomTom\libs\AceEvent-3.0\AceEvent-3.0.lua:119>