SQL-DATABASE ERROR

Database error in Abiunity Script: Invalid SQL: INSERT INTO bb3_sessions (hash,userid,user_data,ipaddress,ipaddress_forwarded,useragent,lastactivity,request_uri,boardid,threadid,mobile_deviceid) VALUES ('26304ea185b762a8df0983738976bd88','0','d95b104187d7a7a8762f17313bfa1fff','54.166.133.84','54.166.133.84','CCBot/2.0 (https://commoncrawl.org/faq/)','1553310888','thread.php?threadid=47345','0','0','')
mysql error: Duplicate entry '26304ea185b762a8df0983738976bd88' for key 'PRIMARY'
mysql error number: 1062
Date: 23.03.2019 @ 04:14
Script: /thread.php?threadid=47345
Referer: