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 ('30e71acd1b95ba021afe2e3c786c2f71', -1, 1722047875, 1722047875, '03951949', -7, 0, 0)

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