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 ('c4beb082f9ca693fa820ca4d56b77e7f',',77,92,137,138,152,153,189,214,215,244,256,270,276,279,284,313,316,323,370,395,453,455,622,624,654,655,686,762,782,786,827,842,905,921,970,1017,1036,1057,1072,1138,1172,1211,1321,1373,1392,1455,1510,1513','1','lastpost','desc','1603423317','0','3.238.4.24')
mysql error: Field 'searchstring' doesn't have a default value
mysql error number: 1364
mysql version: 5.7.31-0ubuntu0.16.04.1
php version: 5.2.17
Date: 23.10.2020 @ 05:21
Script: /search.php?action=user&userid=4
Referer: