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 ('6a6a2f97b55b24072b96738c21a39db7', -1, 1764749820, 1764749820, 'd849d8a7', 6, 0, 0)

Line : 187
File : sessions.php