diff --git a/sapl/base/models.py b/sapl/base/models.py
index 033812735..15e14e39c 100644
--- a/sapl/base/models.py
+++ b/sapl/base/models.py
@@ -184,7 +184,8 @@ class AppConfig(models.Model):
         config = AppConfig.objects.first()
 
         if not config:
-            return ''
+            config = AppConfig()
+            config.save()
 
         return getattr(config, attr)
 
diff --git a/sapl/materia/tests/test_materia.py b/sapl/materia/tests/test_materia.py
index c7a773a9c..a538cfb87 100644
--- a/sapl/materia/tests/test_materia.py
+++ b/sapl/materia/tests/test_materia.py
@@ -1,9 +1,9 @@
-import pytest
 from django.contrib.auth import get_user_model
 from django.contrib.contenttypes.models import ContentType
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.core.urlresolvers import reverse
 from model_mommy import mommy
+import pytest
 
 from sapl.base.models import Autor, TipoAutor
 from sapl.comissoes.models import Comissao, TipoComissao
diff --git a/sapl/rules/apps.py b/sapl/rules/apps.py
index b16f45905..3b6e9d271 100644
--- a/sapl/rules/apps.py
+++ b/sapl/rules/apps.py
@@ -127,7 +127,7 @@ def create_proxy_permissions(
 
 
 def update_groups(app_config, verbosity=2, interactive=True,
-                  using=DEFAULT_DB_ALIAS, cria_usuarios_padrao=True,
+                  using=DEFAULT_DB_ALIAS, cria_usuarios_padrao=False,
                   **kwargs):
 
     if app_config != AppConfig and not isinstance(app_config, AppConfig):