SQL-DATABASE ERROR

Database error in pd Script: Invalid SQL: Insert Into pd_rechnung (sessionid, zeit, art) Values ('q0ebpf42k3reaumque548o3b73', 1685852690, 2)
mysql error: Field 'iduser' doesn't have a default value
mysql error number: 1364
Date: 04.06.2023 @ 06:24
Script: /rechnung_neu.php?step=2&art=2&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe
Referer: