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 ('6d83f818f9b59a0867bb3e4157a5964c', -1, 1757040368, 1757040368, 'd849d80f', 22, 0, 0)

Line : 247
File : sessions.php