'AnonymousUser' object is not iterable

This error might arise if you are trying to logging in as a guest user. In my project i m trying to provide membership on the basis of free,enterprise and professional and i got the same error.

so replace

return ClientProfile.objects.get(user=request.user) with

return ClientProfile.objects.filter().first()

In Django 1.9 and earlier, is_authenticated() is a method, you must call it.

if not request.user.is_authenticated():
    ...

It's an easy mistake to forget to call the method. In your case it's causing an error, but in other cases it might allow users to have access to data that they shouldn't. From Django 1.10, is_authenticated is changing to a property to prevent this.