SQL-DATABASE ERROR

Database error in pd Script: Invalid SQL: Insert Into pd_rechnung (sessionid, zeit, art) Values ('o78l3236hq2crb1l98gf5gh4r6', 1714638314, 2)
mysql error: Field 'iduser' doesn't have a default value
mysql error number: 1364
Date: 02.05.2024 @ 10:25
Script: /rechnung_neu.php?step=2&art=2&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe
Referer: http://rechnung.name/rechnung_neu.php?step=2&art=2&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe