C# script about mesh report not working with solid mesh

Mesh Report Debug V0.gh (1.1 MB)
Hi, I am trying to learn C# scripting, and I’ve created a simple script that generates a mesh report. However, I’m encountering an issue—it doesn’t work with meshes that have no naked edges. I’ve spent hours trying to debug it, but I haven’t had good results.
Could you please help me identify the problem?
Thank you!

The error message shows:

1. Object reference not set to an instance of an object. (line: 96)

string validText,closedText, manifoldText;
Boolean isOriented,hasBoundary;

if (M.IsValid)
{
  validText = "valid";
}
else
{
  validText = "not valid";
}


if (M.IsClosed)
{
  closedText = "closed";
}
else
{
  closedText = "not closed";
}


if (M.IsManifold(true, out isOriented, out hasBoundary))
{
  manifoldText = "manifold";
}
else
{
  manifoldText = "not manifold";
}



int nbDisjointPieces = M.DisjointMeshCount;

int nNakedEdges = 0;
Polyline [] plines = M.GetNakedEdges();

for (int i = 0; i < plines.Length; i++) {
  nNakedEdges += plines[i].Count - 1;
}



string meshReport = String.Format("Mesh is {0}, {1}, {2}. Mesh has {3} disjoint Pieces, {4} naked edges", validText, closedText, manifoldText, nbDisjointPieces, nNakedEdges);
Report = meshReport;

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