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 ('d959377db59968c80f82bad26f2ad79c', -1, 1764819072, 1764819072, 'd849d8a7', 7, 0, 0)

Line : 187
File : sessions.php