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, zone) VALUES ('f33322264d8cf1bdc842647c15f8703b','0','38.107.191.96','CCBot/1.0 (+http://www.commoncrawl.org/bot.html)','1283847990','thread.php','0','0','', 'F')
mysql error: Duplicate entry 'f33322264d8cf1bdc842647c15f8703b' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.1.47
php version: 5.3.2
Date: 07.09.2010 @ 10:26
Script: /freunde-finden-f47/nette-leutz-aus-dem-ruhrpott-t41736/1/
Referer: