MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1062 - Duplicate entry '0' for key 'uid'
Query:
REPLACE INTO mybb_sessions SET `uid`='0',`sid`='6bade7aefe21efa1dd9b6147216f338c',`time`='1711616809',`ip`='54.226.126.38',`location`='/showthread.php?tid=4&pid=79&mode=threaded',`useragent`='claudebot',`location1`='3',`location2`='4',`nopermission`='0'