diff --git a/imaginaerraum_door_admin/__init__.py b/imaginaerraum_door_admin/__init__.py
index d99f067..cc09e8d 100644
--- a/imaginaerraum_door_admin/__init__.py
+++ b/imaginaerraum_door_admin/__init__.py
@@ -74,7 +74,7 @@ def create_super_admins(app, user_datastore):
 def create_app():
     app = Flask(__name__)
     app.config.from_object('imaginaerraum_door_admin.default_app_config.DefaultConfig')
-    app.config.from_envvar('APPLICATION_SETTINGS')
+    app.config.from_envvar('APPLICATION_SETTINGS', silent=True)
 
 
     token_file = Path(app.config.get('TOKEN_FILE'))