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`='6bd130139b2ee6601833c3eb6be5a832',`time`=1711622944,`ip`=X'365946a1',`location`='/showthread.php?tid=7707&pid=98283',`useragent`='claudebot',`location1`=2,`location2`=7707,`nopermission`=0