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 ('21af39e1e8c817a735b51d0dc3c123d2', -1, 1638318995, 1638318995, '035c1c34', -9, 0, 0)

Line : 187
File : sessions.php