Fixed #27148 -- Fixed ModelMultipleChoiceField crash with invalid UUID.

tests/model_forms/test_uuid.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 from django import forms
+from django.core.exceptions import ValidationError
 from django.test import TestCase
 
 from .models import UUIDPK
@@ -27,3 +28,8 @@ class ModelFormBaseTest(TestCase):
         msg = "The UUIDPK could not be changed because the data didn't validate."
         with self.assertRaisesMessage(ValueError, msg):
             form.save()
+
+    def test_model_multiple_choice_field_uuid_pk(self):
+        f = forms.ModelMultipleChoiceField(UUIDPK.objects.all())
+        with self.assertRaisesMessage(ValidationError, "'invalid_uuid' is not a valid UUID."):
+            f.clean(['invalid_uuid'])