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 ('9d13d2eb627b46a129e61d5106a5132c', -1, 1501327831, 1501327831, '1714c121', 0, 0, 0)

Line : 187
File : sessions.php