SQL-DATABASE ERROR

Database error in pd Script: Invalid SQL: Insert Into pd_rechnung (sessionid, zeit, art) Values ('8rr3k0h4bd5tj618dnfud9e543', 1714921415, 2)
mysql error: Field 'iduser' doesn't have a default value
mysql error number: 1364
Date: 05.05.2024 @ 17:03
Script: /rechungs-system/rechnung_neu.php?step=2&art=2&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe
Referer: http://phpspezial.de/rechungs-system/rechnung_neu.php?step=2&art=2&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe