phpBB : Erro Crítico

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO f_activesessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('771a6a8e81d063b85f6c4aae6101f171', -1, 1764651471, 1764651471, 'd849d88b', 6, 0, 0)

Line : 187
File : sessions.php