phpBB by Przemo : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('760679e73ddb7f5a5bb5c12818ead863', -1, 1539729215, 1539729215, '36c60f14', 11, 0, 0)

Line : 445
File : sessions.php