SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6 v2): Invalid SQL: INSERT INTO bb2_privatemessagereceipts (privatemessageid, recipientid, recipient, blindcopy) VALUES
mysql error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
mysql error number: 1064
mysql version: 5.7.35-38
php version: 5.3.29
Date: 05.05.2024 @ 03:04
Script: /index.php?hidecat=6&sid=cdd36f8532c03901c1615688f0e42156
Referer: http://forumok.eu/index.php?hidecat=6&sid=cdd36f8532c03901c1615688f0e42156