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 ('b7db735a1439a4d033815a60dd0241fb', -1, 1722048786, 1722048786, '0380c5c1', 0, 0, 0)

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