Please look at the code. The error continues.

An exception occurs and I don't understand why.
All values ​​are entered, but an exception error occurs when the 581st for loop is executed. Please help.

for (int i = 1; i <= triangles.Length(); i++)
{
try
{
Poly_Triangle triangle = triangles.Value(i);

int n1 = 0, n2 = 0, n3 = 0;

triangle.Get(n1, n2, n3);

if (reversed)
{
int tmp = n1;
n1 = n2;
n2 = tmp;
}

gp_Pnt p1 = tri.Node(n1);
gp_Pnt p2 = tri.Node(n2);
gp_Pnt p3 = tri.Node(n3);

//Handle(Geom_TrimmedCurve) aSegment1 = GC_MakeSegment(p1, p2);
//Handle(Geom_TrimmedCurve) aSegment2 = GC_MakeSegment(p2, p3);
//Handle(Geom_TrimmedCurve) aSegment3 = GC_MakeSegment(p3, p1);

TopoDS_Edge anEdge1 = BRepBuilderAPI_MakeEdge(p1, p2);
TopoDS_Edge anEdge2 = BRepBuilderAPI_MakeEdge(p2, p3);
TopoDS_Edge anEdge3 = BRepBuilderAPI_MakeEdge(p3, p1);

TopoDS_Wire aWire = BRepBuilderAPI_MakeWire(anEdge1, anEdge2, anEdge3);

Handle(AIS_Shape) aShape = new AIS_Shape(aWire);
myAISContext()->Display(aShape, AIS_WireFrame, 0, true);
}

catch (const std::exception& ex)
{
std::cout << ex.what() << std::endl;
}

myView()->FitAll(0.1);
}