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 ('63ef09c8da67c65a50d6d3e3a6def08d', -1, 1722038039, 1722038039, '12e3345e', -4, 0, 0)

Line : 172
File : /home/rebkell/public_html/boards/includes/sessions.php