Notice in line 120 in classes/helper/HelperForm.php [8] Undefined variable: id

[jarnold]

I am getting an backoffice error: Notice in line 120 in ../classes/helper/HelperForm.php [8] Undefined variable: id

This appears in the carrier section if I want to edit the carrier settings.
Prestashop 8.1.3

The error is shown only on the top in the BO. It seems that it has no impact on the function. But it would be nice to fix it because it could might cause errors in the future.

I have setup 8 carrier on the backoffice an another comes from the module Packeta v.2.1.19.

Deaktivating the module does not results in any changes.

Does anybody has an idea where to look for?

Edited March 1 by jarnold (see edit history)