SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('aa9f3163173406fd19e53555f9fa2c9f','0','18.227.0.192','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715282106','formmail.php?threadid=1135&sid=ab1f9e6b3d66411ef7abc32a65c94bb6','0','0','')
mysql error: Duplicate entry 'aa9f3163173406fd19e53555f9fa2c9f' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 09.05.2024 @ 21:15
Script: /formmail.php?threadid=1135&sid=ab1f9e6b3d66411ef7abc32a65c94bb6
Referer: