Runtime error in edge.py

[bimworld]

I get a runtime error calling the is_line function in Utils' edge.py

b = BRepPrimAPI_MakeBox(10, 20, 30).Shape()
t = Topo(b)
ed = next(t.edges())
my_e = Edge(ed)
print(my_e.is_line())

return self.adaptor.NbKnots()
RuntimeError: Standard_NoSuchObject
GeomAdaptor_Curve::NbKnots
wrapper details:

• symname: Adaptor3d_Curve_NbKnots
• wrapname: _wrap_Adaptor3d_Curve_NbKnots
• fulldecl: Standard_Integer Adaptor3d_Curve::NbKnots()