Mod_python error: "PythonHandler django.core.handlers.modpython"

Traceback (most recent call last):

  File "/usr/lib/python2.3/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/usr/lib/python2.3/site-packages/django/core/handlers/modpython.py", line 228, in handler
    return ModPythonHandler()(req)

  File "/usr/lib/python2.3/site-packages/django/core/handlers/modpython.py", line 201, in __call__
    response = self.get_response(request)

  File "/usr/lib/python2.3/site-packages/django/core/handlers/base.py", line 67, in get_response
    response = middleware_method(request)

  File "/usr/lib/python2.3/site-packages/django_tracking-0.2.7-py2.3.egg/tracking/middleware.py", line 137, in process_request

  File "/usr/lib/python2.3/site-packages/django_tracking-0.2.7-py2.3.egg/tracking/utils.py", line 23, in get_ip

AttributeError: 'NoneType' object has no attribute 'group'