phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 1194 Table 's' is marked as crashed and should be repaired

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_id = '83c8f2c0ff94742af9db7c8bcf4a5c39' AND u.user_id = s.session_user_id

Line : 315
File : sessions.php