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-rw-r--r--django/forms/models.py3
1 files changed, 1 insertions, 2 deletions
diff --git a/django/forms/models.py b/django/forms/models.py
index 4c7db27360..104369c0b0 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -1137,8 +1137,7 @@ class BaseInlineFormSet(BaseModelFormSet):
# Add the inline foreign key field to form._meta.fields if it's defined
# to make sure validation isn't skipped on that field.
if self.form._meta.fields and self.fk.name not in self.form._meta.fields:
- if isinstance(self.form._meta.fields, tuple):
- self.form._meta.fields = list(self.form._meta.fields)
+ self.form._meta.fields = list(self.form._meta.fields)
self.form._meta.fields.append(self.fk.name)
def initial_form_count(self):