Customer isn't created for a user while trying to log in with google

For my website, its all okay if I register and then log in. But when I try to log in with google Customer objects is unable to create. Therefore I found the error that User has no Customer.

Here's my model view for customer:

user = models.OneToOneField(User, on_delete=models.CASCADE, related_name = 'customer', null=True, blank=True)

I tried to implement Customer creation but it seems no effect.

views.py:

def google_login(request):
    redirect_uri = "http://127.0.0.1:8000/accounts/google/login/callback/" % (
    request.scheme, request.get_host(), reverse('pain:google_login')
)
if('code' in request.GET):
    params = {
        'grant_type': 'authorization_code',
        'code': request.GET.get('code'),
        'redirect_uri': redirect_uri,
        'client_id': settings.GP_CLIENT_ID,
        'client_secret': settings.GP_CLIENT_SECRET
    }
    url = 'https://accounts.google.com/o/oauth2/token'
    response = request.post(url, data=params)
    url = 'https://www.googleapis.com/oauth2/v1/userinfo'
    access_token = response.json().get('access_token')
    response = request.get(url, params={'access_token': access_token})
    user_data = response.json()
    email = user_data.get('email')
    if email:
        user, _ = User.objects.get_or_create(email=email, username=email)
        Customer.objects.get_or_create(email=email, username=email)
        gender = user_data.get('gender', '').lower()
        if gender == 'male':
            gender = 'M'
        elif gender == 'female':
            gender = 'F'
        else:
            gender = 'O'
        data = {
            'first_name': user_data.get('name', '').split()[0],
            'last_name': user_data.get('family_name'),
            'google_avatar': user_data.get('picture'),
            'gender': gender,
            'is_active': True
        }
        user.__dict__.update(data)
        user.save()
        user.backend = settings.AUTHENTICATION_BACKENDS[0]
        login(request, user)
    else:
        messages.error(
            request,
            'Unable to login with Gmail Please try again'
        )
    return redirect('/')
else:
    url = "https://accounts.google.com/o/oauth2/auth?client_id=%s&response_type=code&scope=%s&redirect_uri=%s&state=google"
    scope = [
        "https://www.googleapis.com/auth/userinfo.profile",
        "https://www.googleapis.com/auth/userinfo.email"
    ]
    scope = " ".join(scope)
    url = url % (settings.GP_CLIENT_ID, scope, redirect_uri)
    return redirect(url)