Ошибка "Сбой ограничения NOT NULL" при добавлении поста

 new_post.save()

#models.py
 
 
class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
 
    def __str__(self):
        return self.user.username
 
 
class Post(models.Model):
    post = models.ForeignKey(Profile, on_delete=models.CASCADE, related_name='posts')
    text = models.TextField()
    published = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
 
 
#views.py
def index(request, pk):
    profile = get_object_or_404(Profile, pk=pk)
 
    posts = profile.posts.all()
    new_post = None
    if request.method == 'POST':
        form = PostForm(data=request.POST)
        if form.is_valid():
            new_post = form.save(commit=False)
            new_post.author = request.user
            new_post.save()
    else:
        form = PostForm()
 
    return render(request, 'account/index.html', {'profile': profile,
                                                  'form': form,
                                                  'new_post': new_post })

posts = profile.posts.all()
    new_post = None
    if request.method == 'POST':
        form = PostForm(data=request.POST)
        if form.is_valid():
            new_post = form.save(commit=False)
            new_post.author = request.user
            new_post.posts = posts
            print(new_post.posts)
            new_post.save()