It started to spam errors when I open my bags.
The text of error:

Error in AdiBags: ...AddOns\TradeSkillMaster\Core\Service\Groups\Core.lua:300: assertion failed! -- details: [Error 00000210E266FE70]
Error in AdiBags: ...AddOns\TradeSkillMaster\Core\Service\Groups\Core.lua:300: assertion failed! -- details: [Error 00000210E266FE70]

...AddOns\TradeSkillMaster\Core\Service\Groups\Core.lua:300: assertion failed!
(tail call): ?
Interface\AddOns\AdiBags\core\Filters-Фильтры.lua:146: in function Filter' Interface\AddOns\AdiBags\widgets\ContainerFrame.lua:717: in function FilterSlot'
Interface\AddOns\AdiBags\widgets\ContainerFrame.lua:751: in function DispatchItem' Interface\AddOns\AdiBags\widgets\ContainerFrame.lua:912: in function RedispatchAllItems'
Interface\AddOns\AdiBags\widgets\ContainerFrame.lua:1055: in function `FullUpdate'
Interface\AddOns\AdiBags\widgets\ContainerFrame.lua:564: in function <Interface\AddOns\AdiBags\widgets\ContainerFrame.lua:550>
[C]: ?
Interface\AddOns\AdiBags\core\Utility.lua:89: in function <Interface\AddOns\AdiBags\core\Utility.lua:81>
Interface\AddOns\AdiBags\widgets\LayeredRegion.lua:119: in function <Interface\AddOns\AdiBags\widgets\LayeredRegion.lua:108>

I can't seem to reproduce that with my inventory. Does the issue still happen when adding this line:

if (slotData == nil or slotData.link == nil) then return end

just before this line:

tsmpath = TSM_API.GetGroupPathByItem(slotData.link)

in Interface/AddOns/AdiBags_TSM.lua?

I added that line and still had the error, also tried disabling all other Adibag's filters, disabling the TSM App Helper, and disabling all other addons.

Yeah, clearly it's a problem caused by a specific item, but I'm not sure where that problem happens, which is why it's hard to debug. I'm going to try to dig in the TSM code to see if it was tied to a recent change they did.

@Sapu94 sorry for summoning you, but are you aware of any changes made in the GetGroupPathByItem() function? It seems that the assert condition is met even for some non-null item links. Is there a way to gracefully handle those problems?

Hehehe, got the error too! I was a bit late in doing my M+ keys, but now I finally got a keystone and that's what triggers this bug.

To fix that I'm passing the item link I get from AdiBags to ToItemString() then GetItemLink() to get a link back, and it seems to work. I'm committing that and tagging a new release.