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 ('6c6f8c0836598b5c0cd91485b49647ed', -1, 1714091664, 1714091664, '0386575f', -9, 0, 0)

Line : 187
File : sessions.php