MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
126 - Index for table './default_mivn1/irmn_sessions.MYI' is corrupt; try to repair it
Query:
REPLACE INTO irmn_sessions SET `uid`=0,`sid`='b467f9e02ce7b7a383257cec2a0641b0',`time`=1711651952,`ip`=X'03e6a2ee',`location`='/showthread.php?tid=3863',`useragent`='claudebot',`location1`=2,`location2`=3863,`nopermission`=0