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 ('3ff16a820b55c8054b8b87117299b4a2', -1, 1769917400, 1769917400, 'd849d8a1', 8, 0, 0)

Line : 187
File : sessions.php