[Python] How to access Block reference attributes in pyautocad

If Bill of Material (BOM) in AutoCAD drawing are in 'Block Reference', to read BOM using pyautocad we can read it using following code.

from pyautocad import Autocad

acad = Autocad()
for obj in acad.iter_objects(['Block']):
if obj.HasAttributes:
obj.GetAttributes()


But it throws exception in
comtypes\automation.py, line 457, in _get_value typ = _vartype_to_ctype[self.vt & ~VT_ARRAY] KeyError: 9

How to read BoM in AutoCAD using pyautocad.

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