"Cannot filter a query once a slice has been taken"

Question

I get this error

Caught AssertionError while rendering: Cannot filter a query once a slice has been taken.

On this line

{% if form.non_field_errors %} 

When I try to do this

copy_pickup_address = ModelChoiceField(required=False, queryset=Address.objects.filter(shipment_pickup__user=user).order_by('-shipment_pickup__created')[:5])

But I need to slice it, because I only want the last 5 addresses. It renders fine, until I choose an address and submit the form. Why doesn't it like this? How can I get around it?