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 ('dd025242ffa1085982bdc2db83a7d309', -1, 1722064984, 1722064984, '12e26259', 15, 0, 0)

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