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 ('91c7bd601f85f01620278a95651d3fed', -1, 1714832128, 1714832128, '12bc46ff', -4, 0, 0)

Line : 187
File : sessions.php