MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
145 - Table './balkania_forum/mybb_sessions' is marked as crashed and should be repaired
Query:
REPLACE INTO mybb_sessions SET `uid`=0,`sid`='1f6983150ae3a76743451b86b2972af7',`time`=1711710470,`ip`=X'3417cbfe',`location`='/memberlist.php?perpage=20&username_match=begins&username=D&sort=regdate&order=descending',`useragent`='claudebot',`location1`=0,`location2`=0,`nopermission`=0