Teleporting on a destroyed foundation?

I cant seem to get the plugin to not let people teleport on a destroyed foundation.  I tested all varibles and cant get it to cancel out.  Is there a way or another plugin to achieve this, or will it ever be added to the current NTeleportation?

Thanks!

It used to check that you were on a foundation (or floor) before letting you save a /sethome, now if  you build a twig foundation and /sethome on it, you can still tp to that /sethome even when the foundation is gone, You used to have to make a stone/metal one in a fairly hidden spot to stop other players from destroying it and your saved *home.
Yea people are getting raided and they blow the foundation and they are still able to enter it.