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`='b95aae3411820c39d5a99b49583163bc',`time`=1711712748,`ip`=X'6b147be3',`location`='/showthread.php?tid=7326&pid=97170',`useragent`='claudebot',`location1`=2,`location2`=7326,`nopermission`=0