Millipede data handling problem

Hi all,

I've recently started using millipede and it seems that all internalized inputs come up as null when trying to 'extract' (and also generate) them. I keep getting the Object reference not set to an instance of an object. (line: 79) error on the marked line.

private void RunScript(object ri, ref object A, ref object B)
{
RStatSystem rs = ri as RStatSystem;

List<Line> slines = new List<Line>();

foreach(RStatBeam b0 in rs.Beams) {

if (b0.StiffnessMultiplier < 0.3) continue;

slines.Add(new Line(b0.P0.ToPoint3d(), b0.P1.ToPoint3d()));
}

A = slines;
}

Also to be more clear, I'm attaching a screenshot.

Does anyone know a solution for this?

Best,

Gediminas