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 ('7d91ac3a2297f58d445a89058e3881bb', -1, 1768504749, 1768504749, 'd849d8de', 1, 0, 0)

Line : 187
File : sessions.php