phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

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

SELECT u.*, s.* FROM sessions s, users u WHERE s.session_id = 'c884796a6fcd58add3a36cf2350ad8cb' AND u.user_id = s.session_user_id

Line : 319
File : sessions.php