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 ('67787b002df1ac9f6f1399aeff46cedb', -1, 1719353589, 1719353589, '641ce33f', 16, 0, 0)

Line : 247
File : sessions.php