WHOIS Doesn't work with HTTPS

Hi, with HTTPS enabled for wordpress admin the WHOIS option doesn’t work in Chrome because try to open an iframe that runs an HTTP content in a secure site.

This is the error in console:

[blocked] The page at https://www.*****.com/wp-admin/admin.php?page=wp-slim-view-1# ran insecure content from http://www.infosniper.net/?ip_address=91.207.7.13.

Is possible to point to a https site for trace ip?

Thanks.

http://wordpress.org/plugins/wp-slimstat/