Fixed #21472 -- Fixed inline formsets display when parent pk is 0

Thanks agale031176@gmail.com for the report.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/forms/models.py b/django/forms/models.py
index 9e8feb2ee9..3625dc8334 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -843,7 +843,7 @@ class BaseInlineFormSet(BaseModelFormSet):
         self.save_as_new = save_as_new
         if queryset is None:
             queryset = self.model._default_manager
-        if self.instance.pk:
+        if self.instance.pk is not None:
             qs = queryset.filter(**{self.fk.name: self.instance})
         else:
             qs = queryset.none()