Value Error in Pyfacebook

Hi i m getting this error

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Traceback (most recent call last):

 File "/usr/local/alwaysdata/python/

django/1.2.1/django/core/handlers/base.py", line 100, in get_response
   response = callback(request, *callback_args, **callback_kwargs)

 File "/usr/local/alwaysdata/python/django/1.2.1/django/utils/decorators.py", line 76, in _wrapped_view
   response = view_func(request, *args, **kwargs)

 File "<string>", line 1, in <lambda>

 File "/home/pankajsingh/company_site/fbapp/facebook/djangofb/__init__.py", line 94, in newview
   return view(request, *args, **kwargs)

 File "/home/pankajsingh/company_site/fbapp/views.py", line 23, in canvas
   user = User.objects.get_current()

 File "/home/pankajsingh/company_site/fbapp/models.py", line 13, in get_current
   user, created = self.get_or_create(id=int(facebook.uid))

ValueError: invalid literal for int() with base 10: 'None'
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need help to get out of this

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Thanking You,

Pankaj Kumar Singh,
3rd Year Undergraduate Student,
Department of Agricultural and Food Engineering,
Indian Institute of Technology,
Kharagpur

Mobile - (+91) 8001231685

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