SQL-DATABASE ERROR

Database error in pd Script: Invalid SQL: Insert Into pd_rechnung (sessionid, zeit, art) Values ('08qukvnk3hiq3t28mup6ak5gu5', 1714785028, 2)
mysql error: Field 'iduser' doesn't have a default value
mysql error number: 1364
Date: 04.05.2024 @ 03:10
Script: /rechnung_neu.php?step=2&art=2&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe
Referer: