phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 144 Table './judgement4/phpbb_sessions' is marked as crashed and last (automatic?) repair failed

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_id = '86ad83f17e1465e4f9b73d3a3b29d9ec' AND u.user_id = s.session_user_id

Line : 315
File : sessions.php