Object reference not set to an instance of an object. (line: 0)

I'm trying to use a C# component in my current grasshoper definition. It's inputs are a number of planes and a curve. It then intersects the curves with the planes and returns the resulting points. I plan to do more, but this is just a start.

My C# component seems to work. The points are displayed, and no errors are sent to the "out" output. However, if I move the input planes the component stops working and returns the error.

error: Object reference not set to an instance of an object. (line: 0)

Yet if I reconnect the wire to the planes inputs of my C# component that seems to force it to refresh and it successfuly runs again. Here's a video of the behavior

http://www.screentoaster.com/watch/stVEJTREVIR1FZRFxZWFpaX1dS/grass...

Is this just a bug? Am I doing something wrong? Has anyone seen this before and know of a solution?