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 ('1e177f87f867441b3ef8107cfec6e733', -1, 1638847746, 1638847746, '36c68b70', 19, 0, 0)

Line : 187
File : sessions.php