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-rw-r--r--django/db/models/fields/__init__.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 61ae393bf6..016e26099b 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -811,6 +811,7 @@ class IPAddressField(Field):
validators.isValidIPAddress4(field_data, None)
class NullBooleanField(Field):
+ empty_strings_allowed = False
def __init__(self, *args, **kwargs):
kwargs['null'] = True
Field.__init__(self, *args, **kwargs)