SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb1_searchs (searchhash,postids,showposts,sortby,sortorder,searchtime,userid,ipaddress) VALUES ('8fb852a3acc5fc01688199d87644c4e7',',1502,1509','1','lastpost','desc','1714636663','0','18.226.28.197')
mysql error: Field 'searchstring' doesn't have a default value
mysql error number: 1364
mysql version: 10.3.39-MariaDB-1:10.3.39+maria~ubu2004
php version: 5.2.17
Date: 02.05.2024 @ 09:57
Script: /search.php?action=user&userid=59&sid=27ce9fc6f0ad4f4a7577e3732943b69a
Referer: