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-rw-r--r--django/forms/forms.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/django/forms/forms.py b/django/forms/forms.py
index a601467e18..81c59dea33 100644
--- a/django/forms/forms.py
+++ b/django/forms/forms.py
@@ -191,7 +191,8 @@ class BaseForm:
def _html_output(self, normal_row, error_row, row_ender, help_text_html, errors_on_separate_row):
"Output HTML. Used by as_table(), as_ul(), as_p()."
- top_errors = self.non_field_errors() # Errors that should be displayed above all fields.
+ # Errors that should be displayed above all fields.
+ top_errors = self.non_field_errors().copy()
output, hidden_fields = [], []
for name, field in self.fields.items():