diff --git a/README.md b/README.md
index f3c752c2..f99c51b7 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ python manage.py loaddata initial_role
 python manage.py sample_data
 ```
 
-Taiga only runs with python 3.3+.
+Taiga only runs with python 3.4+
 
 Initial auth data: admin/123123
 
diff --git a/taiga/projects/tasks/signals.py b/taiga/projects/tasks/signals.py
index cbc633d1..03e65ddd 100644
--- a/taiga/projects/tasks/signals.py
+++ b/taiga/projects/tasks/signals.py
@@ -14,6 +14,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from contextlib import suppress
+from django.core.exceptions import ObjectDoesNotExist
 
 ####################################
 # Signals for cached prev task
@@ -84,7 +86,8 @@ def _try_to_close_or_open_milestone_when_create_or_edit_task(instance):
 
 
 def _try_to_close_milestone_when_delete_task(instance):
-    from taiga.projects.milestones import services as milestone_service
+    from taiga.projects.milestones import services
 
-    if instance.milestone_id and milestone_service.calculate_milestone_is_closed(instance.milestone):
-            milestone_service.close_milestone(instance.milestone)
+    with suppress(ObjectDoesNotExist):
+        if instance.milestone_id and services.calculate_milestone_is_closed(instance.milestone):
+            services.close_milestone(instance.milestone)
diff --git a/tests/integration/test_close_uss.py b/tests/integration/test_close_uss.py
index 64f515d8..992f30de 100644
--- a/tests/integration/test_close_uss.py
+++ b/tests/integration/test_close_uss.py
@@ -15,12 +15,13 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from tests import factories as f
-
-from taiga.projects.userstories.models import UserStory
 
 import pytest
 
+from taiga.projects.userstories.models import UserStory
+from taiga.projects.tasks.models import Task
+
+from tests import factories as f
 pytestmark = pytest.mark.django_db
 
 
@@ -191,7 +192,33 @@ def test_us_delete_task_then_all_closed(data):
     assert data.user_story1.is_closed is True
 
 
-def test_us_change_task_us_then_all_closed(data):
+def test_auto_close_userstory_with_milestone_when_task_and_milestone_are_removed(data):
+    milestone = f.MilestoneFactory.create()
+
+    data.task1.status = data.task_closed_status
+    data.task1.milestone = milestone
+    data.task1.save()
+    data.task2.status = data.task_closed_status
+    data.task2.milestone = milestone
+    data.task2.save()
+    data.task3.status = data.task_open_status
+    data.task3.milestone = milestone
+    data.task3.save()
+    data.user_story1.milestone = milestone
+    data.user_story1.save()
+
+    data.user_story1 = UserStory.objects.get(pk=data.user_story1.pk)
+    assert data.user_story1.is_closed is False
+
+    data.task3 = Task.objects.get(pk=data.task3.pk)
+    milestone.delete()
+    data.task3.delete()
+
+    data.user_story1 = UserStory.objects.get(pk=data.user_story1.pk)
+    assert data.user_story1.is_closed is False
+
+
+def test_auto_close_us_when_all_tasks_are_changed_to_close_status(data):
     data.task1.status = data.task_closed_status
     data.task1.save()
     data.task2.status = data.task_closed_status