diff --git a/openslides/motion/templates/motion/motion_detail.html b/openslides/motion/templates/motion/motion_detail.html
index 170ba55ec..cb1de90d1 100644
--- a/openslides/motion/templates/motion/motion_detail.html
+++ b/openslides/motion/templates/motion/motion_detail.html
@@ -130,9 +130,11 @@
                         <a href="{% model_url version %}" title="{% trans 'Show' %}" class="btn btn-mini">
                             <i class="icon-search"></i>
                         </a>
-                        <a href="{% model_url version 'delete' %}" title="{% trans 'Delete' %}" class="btn btn-mini">
-                            <i class="icon-remove"></i>
-                        </a>
+                        {% if version != motion.active_version %}
+                            <a href="{% model_url version 'delete' %}" title="{% trans 'Delete' %}" class="btn btn-mini">
+                                <i class="icon-remove"></i>
+                            </a>
+                        {% endif %}
                     </td>
                 </tr>
                 {% if forloop.last %}
diff --git a/openslides/motion/views.py b/openslides/motion/views.py
index 8512681de..bbbcc31ab 100644
--- a/openslides/motion/views.py
+++ b/openslides/motion/views.py
@@ -303,10 +303,19 @@ class VersionDeleteView(DeleteView):
     success_url_name = 'motion_detail'
 
     def get_object(self):
-        motion_id = int(self.kwargs.get('pk'))
-        version_number = int(self.kwargs.get('version_number'))
-        return MotionVersion.objects.get(motion=motion_id,
-                                         version_number=version_number)
+        try:
+            motion = Motion.objects.get(pk=int(self.kwargs.get('pk')))
+        except Motion.DoesNotExist:
+            raise Http404('Motion %s not found.' % self.kwargs.get('pk'))
+        try:
+            version = MotionVersion.objects.get(
+                motion=motion,
+                version_number=int(self.kwargs.get('version_number')))
+        except MotionVersion.DoesNotExist:
+            raise Http404('Version %s not found.' % self.kwargs.get('version_number'))
+        if version == motion.active_version:
+            raise Http404('You can not delete the active version of a motion.')
+        return version
 
     def get_success_url_name_args(self):
         return (self.object.motion_id, )
@@ -333,7 +342,7 @@ class VersionPermitView(SingleObjectMixin, QuestionMixin, RedirectView):
         try:
             self.version = self.object.versions.get(version_number=int(version_number))
         except MotionVersion.DoesNotExist:
-            raise Http404('Version %s not found' % version_number)
+            raise Http404('Version %s not found.' % version_number)
         return super(VersionPermitView, self).get(*args, **kwargs)
 
     def get_url_name_args(self):
diff --git a/tests/motion/test_models.py b/tests/motion/test_models.py
index 9db4cc796..943f9f481 100644
--- a/tests/motion/test_models.py
+++ b/tests/motion/test_models.py
@@ -150,7 +150,7 @@ class ModelTest(TestCase):
         motion = Motion.objects.create(title='foo', text='bar', identifier='')
         motion.active_version = None
         motion.save(update_fields=['active_version'])
-        self.assertEqual(str(motion), 'foo')  # motion.__unicode__() did rais an AttributeError
+        self.assertEqual(str(motion), 'foo')  # motion.__unicode__() raised an AttributeError
 
 
 class ConfigTest(TestCase):
diff --git a/tests/motion/test_views.py b/tests/motion/test_views.py
index e3be2e3c5..7726aef1c 100644
--- a/tests/motion/test_views.py
+++ b/tests/motion/test_views.py
@@ -412,6 +412,7 @@ class TestVersionPermitView(MotionViewTestCase):
 
 class TestVersionDeleteView(MotionViewTestCase):
     def test_get(self):
+        self.motion1.save(use_version=self.motion1.get_new_version(title='new', text='new'))
         response = self.check_url('/motion/1/version/1/del/', self.admin_client, 302)
         self.assertRedirects(response, '/motion/1/version/1/')
 
@@ -424,3 +425,10 @@ class TestVersionDeleteView(MotionViewTestCase):
         response = self.admin_client.post('/motion/1/version/2/del/', {'yes': 1})
         self.assertRedirects(response, '/motion/1/')
         self.assertEqual(self.motion1.versions.count(), 2)
+
+    def test_delete_active_version(self):
+        self.motion1.save(use_version=self.motion1.get_new_version(title='new_title_yae6Aequaiw5saeb8suG', text='new'))
+        motion = Motion.objects.all()[0]
+        self.assertEqual(motion.get_active_version().title, 'new_title_yae6Aequaiw5saeb8suG')
+        response = self.admin_client.post('/motion/1/version/2/del/', {'yes': 1})
+        self.assertEqual(response.status_code, 404)