phpBB : 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 ('71f9d1875f8d4ebbf3a09173a62c06c5', -1, 1714191707, 1714191707, '03904d47', 6, 0, 0)

Line : 187
File : sessions.php