if not request.user.is_authenticated:
return None
try:
return ClientProfile.objects.get(user=request.user)
except ClientProfile.DoesNotExist:
return None
>
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.