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 ('41437af8f17f9f5c0662e679c943e6d1', -1, 1714042228, 1714042228, '0390e996', -4, 0, 0)

Line : 187
File : sessions.php