SQL-DATABASE ERROR

Database error in pd Script: Invalid SQL: Insert Into pd_rechnung (sessionid, zeit, art) Values ('508b3t45u8c05ede8io3vg3hu3', 1713445080, 1)
mysql error: Field 'iduser' doesn't have a default value
mysql error number: 1364
Date: 18.04.2024 @ 14:58
Script: /rechnung_neu.php?step=2&art=1&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe
Referer: