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 ('777bfe9217d405d3c063f74e6d108fae', -1, 1757904375, 1757904375, 'd849d828', -9, 0, 0)

Line : 187
File : sessions.php