phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d727e26f84f0b9a101cf3ade0c4234bb', -1, 1493502181, 1493502181, '36c68fdf', -8, 0, 0)

Line : 187
File : sessions.php