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 ('b4e8278768b61ec6659d1508ff9b2ca3', -1, 1506145370, 1506145370, '36e1278e', 5, 0, 0)

Line : 187
File : sessions.php