SQL-DATABASE ERROR

Database error in pd Script: Invalid SQL: Insert Into pd_rechnung (sessionid, zeit, art) Values ('peumaqqclh6jnubcce1umaa7h1', 1722064486, 2)
mysql error: Field 'iduser' doesn't have a default value
mysql error number: 1364
Date: 27.07.2024 @ 09:14
Script: /rechnung_neu.php?step=2&art=2&phpMyAdmin=kSdVEcrW9JgLk8afnGhkZl7xHhe
Referer: