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 ('b391ccd145c286af50f0ce5eb59210c2', -1, 1768642501, 1768642501, 'd849d854', 8, 0, 0)

Line : 187
File : sessions.php