2 files changed, 18 insertions, 2 deletions
diff --git a/tests/regressiontests/model_fields/models.py b/tests/regressiontests/model_fields/models.py
index 39c9abe17d..0e365fec30 100644
--- a/tests/regressiontests/model_fields/models.py
+++ b/tests/regressiontests/model_fields/models.py
@@ -63,7 +63,11 @@ class BigInt(models.Model):
 class Post(models.Model):
     title = models.CharField(max_length=100)
     body = models.TextField()
-    
+
+class NullBooleanModel(models.Model):
+    nbfield = models.NullBooleanField()
+
+
 ###############################################################################
 # ImageField
 
diff --git a/tests/regressiontests/model_fields/tests.py b/tests/regressiontests/model_fields/tests.py
index d7591d5a22..9d50daf871 100644
--- a/tests/regressiontests/model_fields/tests.py
+++ b/tests/regressiontests/model_fields/tests.py
@@ -6,7 +6,7 @@ from django import forms
 from django.db import models
 from django.core.exceptions import ValidationError
 
-from models import Foo, Bar, Whiz, BigD, BigS, Image, BigInt, Post
+from models import Foo, Bar, Whiz, BigD, BigS, Image, BigInt, Post, NullBooleanModel
 
 try:
     from decimal import Decimal
@@ -40,6 +40,18 @@ class BasicFieldTests(django.test.TestCase):
         form_field = model_field.formfield(show_hidden_initial=False)
         self.assertFalse(form_field.show_hidden_initial)
 
+    def test_nullbooleanfield_blank(self):
+        """
+        Regression test for #13071: NullBooleanField should not throw
+        a validation error when given a value of None.
+        
+        """
+        nullboolean = NullBooleanModel(nbfield=None)
+        try:
+            nullboolean.full_clean()
+        except ValidationError, e:
+            self.fail("NullBooleanField failed validation with value of None: %s" % e.messages)
+
 class DecimalFieldTests(django.test.TestCase):
     def test_to_python(self):
         f = models.DecimalField(max_digits=4, decimal_places=2)