Reference to form cleaned data field throws TypeError: 'exceptions.AttributeError' object is not callable

This is the strangest bug I've seen in Django. (1.6.4 on Ubuntu 14.04, Python 2.7.6)
 It is sporadic, but once it starts happening, it is consistent until I restart the process.
To try and debug it, I print the value of self.cleaned_data just before it occurs. The value prints fine.


The code:

    def clean_email(self):
        logger.warn("Debugging Attribute error:%s" % pprint.pformat(self.cleaned_data))
        try:
            FytUser.objects.get(email=self.cleaned_data['email'])
            raise forms.ValidationError('A user with that email address already exists.')
        except FytUser.DoesNotExist:
            return self.cleaned_data['email']


The traceback in the uwsgi logs:

Debugging Attribute error:{'email': u'test@test.net'}

Traceback (most recent call last):      File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 114, in get_response      response = wrapped_callback(request, *callback_args, **callback_kwargs)      File "./registration/views.py", line 54, in preregister_check      if form.is_valid():      File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 129, in is_valid      return self.is_bound and not bool(self.errors)      File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 121, in errors      self.full_clean()      File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 273, in full_clean      self._clean_fields()      File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 291, in _clean_fields      value = getattr(self, 'clean_%s' % name)()      File "./fyt/forms.py", line 87, in clean_email      FytUser.objects.get(email=self.cleaned_data['email'])      File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py", line 151, in get      return self.get_queryset().get(*args, **kwargs)      File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 307, in get      self.model._meta.object_name)    TypeError: 'exceptions.AttributeError' object is not callable      <WSGIRequest  path:/prereg_check/,  GET:<QueryDict: {}>,  POST:<QueryDict: {u'birthday_year': [u'1900'], u'password2': [u'xxxxx'], u'last_name': [u'W'], u'is_member': [u'1'], u'gender': [u'2'], u'first_name': [u'G'], u'birthday_day': [u'01'], u'birthday_month': [u'01'], u'csrfmiddlewaretoken': [u'MYKnPppKtnKV4ybQ86rkYsv8Er2LIc1a'], u'password': [u'xxxxx'], u'email': [u'test@test.net'], u'discount_code': [u'']}>,  COOKIES:{'_ga': 'xxxxxxx',   'csrftoken': 'xxxxxxxxx',   'sessionid': 'xxxxxx',   'signup_modal': 'true'},  META:{'CONTENT_LENGTH': '221',   'CONTENT_TYPE': 'application/x-www-form-urlencoded; charset=UTF-8',   u'CSRF_COOKIE': u'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',   'DOCUMENT_ROOT': '/home/xxxxxx',   'HTTP_ACCEPT': 'application/json, text/javascript, */*; q=0.01',   'HTTP_ACCEPT_ENCODING': 'gzip, deflate',   'HTTP_ACCEPT_LANGUAGE': 'en-US,en;q=0.5',   'HTTP_CACHE_CONTROL': 'no-cache',   'HTTP_CONNECTION': 'keep-alive',   'HTTP_CONTENT_LENGTH': '221',   'HTTP_CONTENT_TYPE': 'application/x-www-form-urlencoded; charset=UTF-8',   'HTTP_COOKIE': 'csrftoken=xxxxxxxxxxx; sessionid=xx; _ga=xxxxxx; signup_modal=true',   'HTTP_HOST': 'findyourtrainer.com',   'HTTP_PRAGMA': 'no-cache',   'HTTP_REFERER': 'https://xxxxx/register?next=/',   'HTTP_USER_AGENT': 'Mozilla/5.0 (X11; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0',   'HTTP_X_REQUESTED_WITH': 'XMLHttpRequest',   'PATH_INFO': u'/prereg_check/',   'QUERY_STRING': '',   'REMOTE_ADDR': 'xxxxxxxxxxxxxxxx',   'REMOTE_PORT': '37998',   'REQUEST_METHOD': 'POST',   'REQUEST_URI': '/prereg_check/',   u'SCRIPT_NAME': u'',   'SERVER_NAME': 'xxxx.com',   'SERVER_PORT': '443',   'SERVER_PROTOCOL': 'HTTP/1.1',   'UWSGI_SCHEME': 'https',   'uwsgi.node': 'xxxxxxxxxxxx.com',   'uwsgi.version': '2.0.4',   'wsgi.errors': <open file 'wsgi_errors', mode 'w' at 0x7f720e9dc150>,   'wsgi.file_wrapper': <built-in function uwsgi_sendfile>,   'wsgi.input': <uwsgi._Input object at 0x7f72072c3a50>,   'wsgi.multiprocess': True,   'wsgi.multithread': False,   'wsgi.run_once': False,   'wsgi.url_scheme': 'https',   'wsgi.version': (1, 0)}>    

This looks like a memory leak to me. Has anyone else seen this?
Thanks in advance,
~G~

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