Empty widget area shown

Hi,
I’m using this plugin to show certain widgets only on the frontpage. I don’t want them to show up anywhere else. No posts, no pages. So far, the restriction is working well except one thing I noticed:

When using the wordpress internal funktion do hide widgets, the widget area I’m using is not even displayed. When using the plugin, the area (which has a different background defined) shows but it’s empty.
My intention is not only hiding the widget (which works nice) but also not showing the widget area (which works with WP itself, but WP won’t include custom post types). Is this actually possible?