mactrack error

[cipfiz]

I try to configure cacti with mactrack from this file:
cacti-0.8.8b.tar.gz
cacti-plugin-0.8.7h-PA-v3.0.tar.gz
mactrack-v2.9-1.tgz

I add a switch in cacti but when I give click Device Tracking - MAC to IP Report View do not show nothing and in te http logs write

HP Notice: Undefined variable: sql_where in /var/www/html/cacti/plugins/mactrack/mactrack_view_interfaces.php on line 530

Please help me to fix this problem.

Thank you,

Ciprian Pinzaru