phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f0a5ac50d2b7e3a1cad403b28aadf258', -1, 1488022895, 1488022895, '36cda84a', 0, 0, 0)

Line : 187
File : sessions.php