phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './db_morepc/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) VALUES ('79dc873f5bd24c1d74eb94b5ff5127e9', -1, 1508397569, 1508397569, '36a6cb4c', 0, 0)

Line : 158
File : sessions.php