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 ('df9b9a7d3ae2ae4f436a51f061de5b87', -1, 1757041116, 1757041116, 'd849d80f', 24, 0, 0)

Line : 247
File : sessions.php