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 ('70924af0d6b5e02c1e4683364dfbb636', -1, 1762212011, 1762212011, 'd849d892', 7, 0, 0)

Line : 187
File : sessions.php