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 ('1c36e23b9856c2afb2091bd112dc9c13', -1, 1638403056, 1638403056, '36eabfca', 18, 0, 0)

Line : 187
File : sessions.php