diff --git a/openslides/config/api.py b/openslides/config/api.py
index fdef1aa67..165a5e56a 100644
--- a/openslides/config/api.py
+++ b/openslides/config/api.py
@@ -34,7 +34,12 @@ class ConfigHandler(object):
         updated_rows = ConfigStore.objects.filter(key=key).update(value=value)
         if not updated_rows:
             ConfigStore.objects.create(key=key, value=value)
-        self._cache[key] = value
+        try:
+            self._cache[key] = value
+        except AttributeError:
+            # This happens, when a config-var is set, before __getitem__ was
+            # called. In this case nothing should happen.
+            pass
 
     def setup_cache(self):
         """
diff --git a/openslides/utils/test.py b/openslides/utils/test.py
index 263aea32e..83187df94 100644
--- a/openslides/utils/test.py
+++ b/openslides/utils/test.py
@@ -25,5 +25,14 @@ class TestCase(_TestCase):
     def _pre_setup(self, *args, **kwargs):
         return_value = super(TestCase, self)._pre_setup(*args, **kwargs)
         post_database_setup.send(sender=self)
-        config.setup_cache()
+        return return_value
+
+    def _post_teardown(self, *args, **kwargs):
+        return_value = super(TestCase, self)._post_teardown(*args, **kwargs)
+        # Resets the config object by deleting the cache
+        try:
+            del config._cache
+        except AttributeError:
+            # The cache has only to be deleted if it exists.
+            pass
         return return_value
diff --git a/tests/config/test_config.py b/tests/config/test_config.py
index 13dfceaca..c6a5db5e9 100644
--- a/tests/config/test_config.py
+++ b/tests/config/test_config.py
@@ -24,7 +24,7 @@ from openslides.config.exceptions import ConfigError, ConfigNotFound
 class HandleConfigTest(TestCase):
 
     def get_config_var(self, key):
-            return config[key]
+        return config[key]
 
     def test_get_config_default_value(self):
         self.assertEqual(config['string_var'], 'default_string_rien4ooCZieng6ah')
@@ -44,6 +44,10 @@ class HandleConfigTest(TestCase):
         config_signal.disconnect(set_simple_config_page_multiple_vars, dispatch_uid='set_simple_config_page_multiple_vars_for_testing')
 
     def test_database_queries(self):
+        """
+        Test that no database queries are send, after the cache was created.
+        """
+        config.setup_cache()
         self.assertNumQueries(0, self.get_config_var, key='string_var')
 
     def test_setup_config_var(self):
@@ -57,13 +61,18 @@ class HandleConfigTest(TestCase):
         self.assertEqual(config['string_var'], 'other_special_unique_string dauTex9eAiy7jeen')
 
     def test_missing_cache_(self):
-        del config._cache
         self.assertEqual(config['string_var'], 'default_string_rien4ooCZieng6ah')
 
     def test_config_contains(self):
         self.assertTrue('string_var' in config)
         self.assertFalse('unknown_config_var' in config)
 
+    def test_set_value_before_getting_it(self):
+        """
+        Try to call __setitem__ before __getitem.
+        """
+        config['my_config_var'] = 'value'
+
 
 class ConfigFormTest(TestCase):