AttributeError at /login/
'AnonymousUser' object has no attribute '_meta'

def login_log(request):
    form = PessoaForm(request.POST, None)
    if request.method == 'POST':
        cnpj = form.data['cnpj']
        senha = form.data['senha']
        print(form.is_valid())
        if form.is_valid():
            user = authenticate(request, cnpj=cnpj, senha=senha)
            user2 = authenticate(request, username=cnpj, password=senha)
            print(user)
            print(user2)
            print(login(request, user))
            #return redirect('dashboard', idpessoa)
    return render(request, 'login.html', {'form': form})

class PessoaForm(ModelForm):
    class Meta:
        model = User
        fields = ['cnpj', 'senha']