django.db.utils.IntegrityError: NOT NULL constraint failed: core_profile.user_id

from django import forms
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from mysite.core.models import Profile



class SignUpForm(UserCreationForm):
email = forms.EmailField(max_length=254, help_text='Required. Inform a valid email address.')
class Meta:
model = User
fields = ('first_name', 'last_name', 'email', 'username', 'password1', 'password2',)

class ProfileForm(forms.ModelForm):
class Meta:
model = Profile
fields = ('birth_date','birth_place', 'adress', 'adress_complement',
'city', 'zip_code', 'drive_licence_num', 'social_secu_num', 'phone_number')from __future__ import unicode_literals

from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver

class Profile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
birth_date = models.DateField(null=True, blank=True)
birth_place = models.CharField(max_length=80, verbose_name= ("Lieu de Naissance"))
email_confirmed = models.BooleanField(default=False)
adress = models.CharField(max_length=80, verbose_name=("Adresse"))
adress_complement = models.CharField(max_length=80, verbose_name=("Complément d'Adresse"))
city = models.CharField(max_length=80, verbose_name=("Ville"))
zip_code = models.IntegerField(null=True, blank=True)
drive_licence_num = models.CharField(max_length=80, verbose_name=("N° du Permis de conduire"))
social_secu_num = models.IntegerField(null=True, blank=True)
phone_number = models.IntegerField(null=True, blank=True)


@receiver(post_save, sender=User)
def update_user_profile(sender, instance, created, **kwargs):
if created:
Profile.objects.create(user=instance)
instance.profile.save()
from django.contrib.auth import login
from django.contrib.auth.decorators import login_required
from django.contrib.auth.models import User
from django.contrib.sites.shortcuts import get_current_site
from django.shortcuts import render, redirect
from django.utils.encoding import force_bytes, force_text
from django.utils.http import urlsafe_base64_encode, urlsafe_base64_decode
from django.template.loader import render_to_string

from mysite.core.forms import SignUpForm, ProfileForm
from mysite.core.models import Profile
from mysite.core.tokens import account_activation_token

def index(request):
return render(request, 'index.html')

@login_required
def home(request):
return render(request, 'home.html')


def signup(request):
if request.method == 'POST':
form = SignUpForm(request.POST)
if form.is_valid():
user = form.save(commit=False)
user.is_active = False
user.save()

current_site = get_current_site(request)
subject = 'Activate Your MySite Account'
message = render_to_string('account_activation_email.html', {
'user': user,
'domain': current_site.domain,
'uid': urlsafe_base64_encode(force_bytes(user.pk)),
'token': account_activation_token.make_token(user),
})
user.email_user(subject, message)

return redirect('account_activation_sent')
else:
form = SignUpForm()
return render(request, 'signup.html', {'form': form})


def account_activation_sent(request):
return render(request, 'account_activation_sent.html')


def activate(request, uidb64, token):
try:
uid = force_text(urlsafe_base64_decode(uidb64))
user = User.objects.get(pk=uid)
except (TypeError, ValueError, OverflowError, User.DoesNotExist):
user = None

if user is not None and account_activation_token.check_token(user, token):
user.is_active = True
user.profile.email_confirmed = True
user.save()
login(request, user)
return redirect('home')
else:
return render(request, 'account_activation_invalid.html')


def complete_profile(request):
#if email_confirmed == True:
if request.user.is_authenticated():
if request.method == 'POST':

form = ProfileForm(request.POST)
if form.is_valid():
form.save()
return render(request, 'home.html')
else:
form = ProfileForm()
return render(request, 'complete_profile.html', {'form': form})
else:
return render(request, 'login.html')

i'm trying to build a customised registration to my site, so i'm using a sign Up with Profile Model that inherits from django User class with "OneToOneField" relation .

i'm having this ERROR after submit a form that i made to let user complete profile information just after SignUp's email confirmation. Look at this diagram :

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

  File "C:\Python36\lib\site-packages\django\core\handlers\exception.py", line 41, in inner

    response = get_response(request)

  File "C:\Python36\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response

    response = self.process_exception_by_middleware(e, request)

  File "C:\Python36\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response

    response = wrapped_callback(request, *callback_args, **callback_kwargs)

  File "C:\Users\admin\Desktop\dev1\mysite\mysite\core\views.py", line 74, in complete_profile

    form.save()

  File "C:\Python36\lib\site-packages\django\forms\models.py", line 451, in save

    self.instance.save()

  File "C:\Python36\lib\site-packages\django\db\models\base.py", line 806, in save

    force_update=force_update, update_fields=update_fields)

  File "C:\Python36\lib\site-packages\django\db\models\base.py", line 836, in save_base

    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)

  File "C:\Python36\lib\site-packages\django\db\models\base.py", line 922, in _save_table

    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)

  File "C:\Python36\lib\site-packages\django\db\models\base.py", line 961, in _do_insert

    using=using, raw=raw)

  File "C:\Python36\lib\site-packages\django\db\models\manager.py", line 85, in manager_method

    return getattr(self.get_queryset(), name)(*args, **kwargs)

  File "C:\Python36\lib\site-packages\django\db\models\query.py", line 1060, in _insert

    return query.get_compiler(using=using).execute_sql(return_id)

  File "C:\Python36\lib\site-packages\django\db\models\sql\compiler.py", line 1099, in execute_sql

    cursor.execute(sql, params)

  File "C:\Python36\lib\site-packages\django\db\backends\utils.py", line 80, in execute

    return super(CursorDebugWrapper, self).execute(sql, params)

  File "C:\Python36\lib\site-packages\django\db\backends\utils.py", line 65, in execute

    return self.cursor.execute(sql, params)

  File "C:\Python36\lib\site-packages\django\db\utils.py", line 94, in __exit__

    six.reraise(dj_exc_type, dj_exc_value, traceback)

  File "C:\Python36\lib\site-packages\django\utils\six.py", line 685, in reraise

    raise value.with_traceback(tb)

  File "C:\Python36\lib\site-packages\django\db\backends\utils.py", line 65, in execute

    return self.cursor.execute(sql, params)

  File "C:\Python36\lib\site-packages\django\db\backends\sqlite3\base.py", line 328, in execute

    return Database.Cursor.execute(self, query, params)

django.db.utils.IntegrityError: NOT NULL constraint failed: core_profile.user_id

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