phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8e55e2ab8a5fed3c3a5777615656724f', -1, 1596551984, 1596551984, '03ec9f82', 2, 0, 0)

Line : 187
File : sessions.php