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`='9daee3b71a3d26bed38db0d06af6ebf1',`time`='1711721810',`ip`='54.196.248.93',`location`='/showthread.php?tid=9&pid=38',`useragent`='claudebot',`location1`='3',`location2`='9',`nopermission`='0'