ContentNotRenderedError / image field in serializer (DRF)

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I have a model for random Products which has an image field and a default image. I want to make it such that the client doesn’t have to send an image when creating a new product through the API (using DRF). Below are the model, serializer and view

# Model
...
total_stock = models.PositiveIntegerField(default=0)
product_image = models.ImageField(upload_to='images', blank=True, default="/static/images/default_product.png")

# Serializer
class ProductSerializer(serializers.ModelSerializer):
    product_image = serializers.ImageField(max_length=None, allow_empty_file=False)

    class Meta:
        model = Product
        fields = [
            'total_stock', 'product_image'...
        ]



# View
class ProductCreate(generics.CreateAPIView):
    permission_classes = [IsAuthenticated]
    queryset = Product.objects.all()
    serializer = ProductSerializer()

In order for the view to accept a payload without an image, I have to modify the serializer like this:

class ProductSerializer(serializers.ModelSerializer):
    product_image = serializers.ImageField(max_length=None, allow_empty_file=False, required=False) # added "required=False"

But when I do that, I get the error:

The response content must be rendered before it can be iterated over.
Request Method: GET
Request URL:    http://127.0.0.1:8000/product/create/
Django Version: 4.0.5
Exception Type: ContentNotRenderedError
Exception Value:    
The response content must be rendered before it can be iterated over.
Exception Location: .../lib/python3.10/site-packages/django/template/response.py, line 127, in __iter__
Python Executable:  /.../bin/python
Python Version: 3.10.4
...

All the other questions I have investigated are with respect to queries but I’m not making a query here.

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