from django.contrib.auth.forms import AuthenticationForm as BaseAuthenticationForm
from django.contrib.auth.models import User
from inc.models import Account, UserProfile, Counter

class AuthenticationForm(BaseAuthenticationForm):

    def clean(self):
    username = self.cleaned_data.get('username')
    user = User.objects.filter(username = username).first()
    if user != None:
        print(user)
        if not user.is_superuser and not user.is_staff:
            account = Account.objects.filter(num_account = UserProfile.objects.filter(user__username = username).first().num_account).first()
            have_counter = Counter.objects.filter(num_account = account).all()
            if not have_counter:
                raise forms.ValidationError('Some text...')
    return self.cleaned_data

from django.contrib.auth import login, authenticate
from .forms import AuthenticationForm

def LogIn(request):
    if request.method == 'POST':
    form = AuthenticationForm(data=request.POST)
    if form.is_valid():
        username = form.cleaned_data.get('username')
        password = form.cleaned_data.get('password')
        user = authenticate(username=username, password=password)
        print(user)
        login(request, user)
        return redirect('/')
    else:
        print(form.errors)
else:
    form = AuthenticationForm()
return render(request, 'userprocessing/login.html', {'form': form})

AnonymousUser' object has no attribute '_meta'