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 = 'c153c8c87896d4d5e673591333b8738a' AND u.user_id = s.session_user_id

Line : 315
File : sessions.php