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 = 'dfa1f3b1c7f16a39c055f0f6a86ed390' AND u.user_id = s.session_user_id

Line : 315
File : sessions.php