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 ('b25405c0061d7bced4ff01c56ea35700', -1, 1775291176, 1775291176, 'd849d86e', -9, 0, 0)

Line : 247
File : sessions.php