phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_backupsessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('88a2fe1eedcc8e2ceb04e9139639e157', -1, 1398244735, 1398244735, '36cdaf90', 9, 0, 0)

Line : 187
File : sessions.php