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`='b6ec96db0c9fb21cfe1c9f2814447879',`time`='1711724517',`ip`='54.166.141.52',`location`='/showthread.php?tid=2&pid=42',`useragent`='claudebot',`location1`='3',`location2`='2',`nopermission`='0'