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 ('279c582af4cfe8b60d6e5f46f76e09f1', -1, 1560792879, 1560792879, '36912d8f', -11, 0, 0)

Line : 191
File : sessions.php