Error while parsing DER certificate with script

[dsoprea]

As requested:

I used M2Crypto to build a certificate and add an subjectAltName "otherName" extension.

$ x509_parse.py test.der 
Traceback (most recent call last):
  File "/usr/local/bin/x509_parse.py", line 8, in <module>
    load_entry_point('pyx509==0.1.4', 'console_scripts', 'x509_parse.py')()
  File "/Library/Python/2.7/site-packages/pyx509/commands.py", line 36, in print_certificate_info_cmd
    print_certificate_info(file(sys.argv[1]).read())
  File "/Library/Python/2.7/site-packages/pyx509/commands.py", line 29, in print_certificate_info
    X509Certificate.from_der(derData).display()
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 56, in from_der
    return cls(asn1[0])
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 754, in __init__
    self.tbsCertificate = Certificate(tbsCert)
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 724, in __init__
    self.extensions = self._create_extensions_list(tbsCertificate.getComponentByName('extensions'))
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 737, in _create_extensions_list
    return [Extension(ext) for ext in extensions]
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 676, in __init__
    self.value = decoderFunction(v)
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 630, in <lambda>
    "2.5.29.17": (asn1_cert_ext.GeneralNames(), lambda v: SubjectAltNameExt(v),
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 281, in __init__
    value = Name(comp)
  File "/Library/Python/2.7/site-packages/pyx509/models.py", line 131, in __init__
    type = str(attr.getComponentByPosition(0).getComponentByName('type'))
AttributeError: 'int' object has no attribute 'getComponentByPosition'