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-rw-r--r--django/forms/models.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/forms/models.py b/django/forms/models.py
index af3d7023c8..78788fc2db 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -676,7 +676,7 @@ class BaseModelFormSet(BaseFormSet):
pk_value = form.instance.pk
else:
try:
- if index:
+ if index is not None:
pk_value = self.get_queryset()[index].pk
else:
pk_value = None