diff --git a/openslides/motions/serializers.py b/openslides/motions/serializers.py
index 6808d9247..8932dda2c 100644
--- a/openslides/motions/serializers.py
+++ b/openslides/motions/serializers.py
@@ -118,6 +118,11 @@ class MotionPollSerializer(ModelSerializer):
             'has_votes')
         validators = (default_votes_validator,)
 
+    def __init__(self, *args, **kwargs):
+        # The following dictionary is just a cache for several votes.
+        self._votes_dicts = {}
+        return super().__init__(*args, **kwargs)
+
     def get_yes(self, obj):
         try:
             result = self.get_votes_dict(obj)['Yes']
@@ -141,9 +146,9 @@ class MotionPollSerializer(ModelSerializer):
 
     def get_votes_dict(self, obj):
         try:
-            votes_dict = self._votes_dict
-        except AttributeError:
-            votes_dict = self._votes_dict = {}
+            votes_dict = self._votes_dicts[obj.pk]
+        except KeyError:
+            votes_dict = self._votes_dicts[obj.pk] = {}
             for vote in obj.get_votes():
                 votes_dict[vote.value] = vote.weight
         return votes_dict
diff --git a/tests/integration/motions/test_viewset.py b/tests/integration/motions/test_viewset.py
index f91b193da..32399ca7c 100644
--- a/tests/integration/motions/test_viewset.py
+++ b/tests/integration/motions/test_viewset.py
@@ -380,6 +380,29 @@ class SetState(TestCase):
         self.assertEqual(Motion.objects.get(pk=self.motion.pk).state.name, 'submitted')
 
 
+class CreateMotionPoll(TestCase):
+    """
+    Tests creating polls of motions.
+    """
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username='admin', password='admin')
+        self.motion = Motion(
+            title='test_title_Aiqueigh2dae9phabiqu',
+            text='test_text_Neekoh3zou6li5rue8iL')
+        self.motion.save()
+
+    def test_create_first_poll_with_values_then_second_poll_without(self):
+        self.poll = self.motion.create_poll()
+        self.poll.set_vote_objects_with_values(self.poll.get_options().get(), {'Yes': 42, 'No': 43, 'Abstain': 44})
+        response = self.client.post(
+            reverse('motion-create-poll', args=[self.motion.pk]))
+        self.assertEqual(self.motion.polls.count(), 2)
+        response = self.client.get(reverse('motion-detail', args=[self.motion.pk]))
+        for key in ('yes', 'no', 'abstain'):
+            self.assertTrue(response.data['polls'][1][key] is None, 'Vote value "{}" should be None.'.format(key))
+
+
 class UpdateMotionPoll(TestCase):
     """
     Tests updating polls of motions.