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 ('1c6a1ee7158c6c3b7fe3f5312c9de3ca', -1, 1714026472, 1714026472, '12e2b1df', -9, 0, 0)

Line : 187
File : sessions.php