[Baertram]

ESOUI is the standard source code but addons are hacking their code in there as well.
If there is no addon name in the error message it's like Sharlikran wrote already: Try and error.
Start to note down your addons and libraries as the error happens.

Make a list which of them are outdated and check if you are able to find a newer/pathed version or an update, the same for the libraries of these addons.
Start with the addons that got to do with inventory AND gamepad as it seems to happen for the gamepad only? Or check, if you are ONLY playing in gamepad mode, if you got any addona ctive not compatible with this, but invenory related.

If not: Go on with gamepad addons and disable those.

And so on until you find the causing one.


Btw: as this seemed to happen here with a "kuta" item try to find out if you are able to reproduce this error with materials e.g.