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 ('c9dea30f3e2a5130c6ea6e511af733e2', -1, 1766511676, 1766511676, 'd849d817', 1, 0, 0)

Line : 187
File : sessions.php