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 ('4dc76ff6dba6d08cdd4f319fb0a4562b', -1, 1709211349, 1709211349, '2cc84d5c', -4, 0, 0)

Line : 187
File : sessions.php