RelatedObjectDoesNotExist: User has no profile. Django 1.11

[m0ntecr1st0]

After registration I get error. In admin page I see, that user is created, but profile doesn't exist.
I see, that user has attribute profile, but when I want to see dir(user.profile), I don't nothing see.
Sory for my bad english

forms.py

from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User

class SignupForm(UserCreationForm):
    phone = forms.CharField()
    fax = forms.CharField(required=False)

    class Meta:
        model = User
        fields = ('username','first_name', 'phone', 'fax', 'password1', 'password2')

views.py

def signup(request):
    if request.method == 'POST':
        form = SignupForm(request.POST, request.FILES)
        if form.is_valid():
            phone = form.cleaned_data.get('phone')
            fax = form.cleaned_data.get('fax')

            user = form.save(commit=False)
            user.is_active = False
            user.save()

            #Here is the error
            profile = user.profile
            profile.phone = phone
            profile.fax = fax
            profile.save()
    else:
        form = SignupForm()

models.py

class Profile(models.Model):
    user = models.OneToOneField(User)
    phone = models.CharField(max_length=40, verbose_name='Phone')
    fax = models.CharField(max_length=40, verbose_name='Fax', blank=True, null=True)

signals.py

@receiver(post_save, sender=User)
def create_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)

@receiver(post_save, sender=User)
def save_user_profile(sender, instance, **kwargs):
    instance.profile.save()

apps.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.apps import AppConfig


class ProfilesConfig(AppConfig):
    name = 'profiles'

        def ready(self):
	    import profiles.signals

[m0ntecr1st0]

I decided. Changed profile = user.profile to

profile = Profile()
profile.user = user