SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Invalid SQL: INSERT INTO bb1_sessions VALUES ('e255955feb428964e881425db99dae69','0','23.20.120.3','CCBot/2.0 (http://commoncrawl.org/faq/)','1508424298','register.php?sid=e255955feb428964e881425db99dae69','0','0','0')
mysql error: Duplicate entry 'e255955feb428964e881425db99dae69' for key 'PRIMARY'
mysql error number: 1062
Date: 19.10.2017 @ 16:44
Script: /board/register.php?sid=e255955feb428964e881425db99dae69
Referer: