phpBB : Critical Error

Error creating new sessions

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ddabd2606c39081c4aa8992d0254b814' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('ddabd2606c39081c4aa8992d0254b814', -1, 1508621356, 1508621356, '36a29a5b', 4, 0, 0)

Line : 187
File : sessions.php