SQL-DATABASE ERROR

Database error in pd Script: Invalid SQL: Insert Into pd_rechnung (sessionid, zeit, art) Values ('ioc39gml76n8ru5qfrirb6e1u7', 1716701642, 1)
mysql error: Field 'iduser' doesn't have a default value
mysql error number: 1364
Date: 26.05.2024 @ 07:34
Script: /rechnung_neu.php?step=2&art=1&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe
Referer: