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 ('afc0add6ce7048d6c63b1b8cc4041063', -1, 1711656979, 1711656979, '22c97a96', -4, 0, 0)

Line : 187
File : sessions.php