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 ('6396370c7dd77db7fb200caab3a4b973', -1, 1638375557, 1638375557, '369efb68', -4, 0, 0)

Line : 187
File : sessions.php