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 ('ca9debc4acb9f1c2d12e7319cb7eda51', -1, 1768835398, 1768835398, 'd849d854', 6, 0, 0)

Line : 187
File : sessions.php