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 ('3b2b5392004d454d240b95fa81791e55', -1, 1767768511, 1767768511, 'd849d82b', 6, 0, 0)

Line : 187
File : sessions.php