weird bug trying to apply Hframes

Hi David,

I have a weird bug here. When I try to intersect some Hframes on the vertical lines, nothing happens and I get I get on Rhino's command line:
"Exception was thrown in ExecConduit(): Object reference not set to an instance of an object."

I show here the problem here:

http://www.screencast.com/t/YWVhNjM2Mj

In this case you will see that in one of the vertical lines sort of works and the other one does not (before I could not do it in any). Even on teh one it works, when I move the slider of how many Hframes things go out of whack again

I'm also attaching the GH definition and Rhino curves I'm using.

Thanks,

Gustavo