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-rw-r--r--django/forms/widgets.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 566bdf25d6..e4f8957189 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -649,6 +649,8 @@ class ChoiceWidget(Widget):
def format_value(self, value):
"""Return selected values as a list."""
+ if value is None and self.allow_multiple_selected:
+ return []
if not isinstance(value, (tuple, list)):
value = [value]
return [str(v) if v is not None else '' for v in value]