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 ('a64d4a8bf94f989804555ff906d3ccd4', -1, 1767581166, 1767581166, 'd849d87f', 8, 0, 0)

Line : 187
File : sessions.php