[Python] TypeError at / cannot unpack non-iterable NoneType object (Django)

I'm trying to set up a system on my Django project where users can comment on individual posts on the main (index) page. However, I'm having an issue when it comes to trying to make it so the comment is automatically connected to the post.

This is the code I tried in views.py:

from django.core import paginator
from django.shortcuts import render, redirect, get_object_or_404
from django.http import HttpResponse
from .models import *
from django.views.generic import ListView, CreateView, UpdateView
from django.views.generic.detail import DetailView
from .forms import *
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth import login
from django.core.paginator import Paginator
from django.views import View
import random

def index(request, pk=None, *args, **kwargs):
postdata = Post_Data.objects.all()
profiledata = ProfileData.objects.all()
likedata = Like.objects.all()
dislikedata = Dislike.objects.all()
comment = PostComment.objects.all()
postid = Post_Data.objects.get(pk)


# Initialize the comment form
if request.method == 'POST':
comment_form = PostCommentForm(request.POST)
if comment_form.is_valid():
post = comment_form.save(commit=False)
post.user = request.user
post.save()
return redirect('/')
else:
comment_form = PostCommentForm() # Create an empty form

# Pass the comment form to the template context
return render(request, 'index.html', {
'title': 'RoamTrip',
'postdata': postdata,
'profiledata': profiledata,
'likedata': likedata,
'dislikedata': dislikedata,
'comment': comment,
'comment_form': comment_form # Make sure this is included
})


models.py:

from django.contrib import admin
from django.db import models
from django.urls import reverse
from django.contrib.auth.models import User
from django.contrib.auth import get_user_model
from django.conf import settings
from .validators import validate_file_extension

# Create your models here.

class Post_Data (models.Model):
user = models.ForeignKey(
settings.AUTH_USER_MODEL,
on_delete=models.CASCADE, # Set the appropriate behavior here
null=True
)
time_data = models.DateTimeField(help_text='Enter Time of Upload Here:', auto_now_add=True)
text_data = models.TextField(help_text='Type Here:')
image_data = models.ImageField(upload_to="website/media/", null=True, blank=True, help_text='Upload Image:')
video_data = models.FileField(null=True, upload_to="website/media/", blank=True, validators=[validate_file_extension])
public_data = models.BooleanField(help_text='Public?', null=True)
approval = models.BooleanField(help_text='Is this post approved?', default=True)

class PostComment(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
post = models.ForeignKey(Post_Data, on_delete=models.CASCADE, related_name='post_comment_id')
post_comment = models.CharField(max_length=500)
timestamp = models.DateTimeField(auto_now_add=True)

def __str__(self):
return f"Comment by {self.user} on {self.post}"


urls.py:

urlpatterns = [
path('', views.index, name='RoamTrip'),
]

urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)


I got this error as a result:

TypeError: cannot unpack non-iterable NoneType object

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