SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb2_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('b442b53394cd118e0a1d24f4517b2c74','0','3.237.71.23','CCBot/2.0 (https://commoncrawl.org/faq/)','1601482352','addreply.php?postid=118882','0','0','')
mysql error: Duplicate entry 'b442b53394cd118e0a1d24f4517b2c74' for key 1
mysql error number: 1062
mysql version: 4.1.22-standard
php version: 5.3.29-1+hw3
Date: 30.09.2020 @ 12:12
Script: /wbb2/addreply.php?postid=118882
Referer: