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 ('121ec3a9060b70ef99da428ceff4e443', -1, 1594607740, 1594607740, '03ec082e', -8, 0, 0)

Line : 172
File : sessions.php