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 ('6b43ea9bf0cae42bceb58eb647c56364', -1, 1713504783, 1713504783, '0394665a', -4, 0, 0)

Line : 187
File : sessions.php