phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 145 Table './forum/phpbb_sessions' is marked as crashed and should be repaired

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_id = '8521b5b8bb7b1e7ca2fe4333b95f706e' AND u.user_id = s.session_user_id

Line : 319
File : sessions.php