diff --git a/slip/dbus/polkit.py b/slip/dbus/polkit.py

index e92db4d..cc3dbd8 100644

--- a/slip/dbus/polkit.py

+++ b/slip/dbus/polkit.py

@@ -206,17 +206,17 @@ class PolKit(object):

     @property

     def _interface(self):

         if not PolKit.__interface:

-            PolKit.__interface = dbus.Interface(self._bus.get_object(

-                self._dbus_name, self._dbus_path),

-                self._dbus_interface)

+            try:

+                PolKit.__interface = dbus.Interface(self._bus.get_object(

+                    self._dbus_name, self._dbus_path),

+                    self._dbus_interface)

+            except dbus.DBusException:

+                pass

         return PolKit.__interface

     @property

     def _polkit_present(self):

-        try:

-            return bool(self._interface)

-        except dbus.DBusException:

-            return False

+        return bool(self._interface)

     def __dbus_system_bus_name_uid(self, system_bus_name):

         bus_object = self._bus.get_object(

@@ -258,8 +258,7 @@ class PolKit(object):

         challenge=True, details={}):

         if not self._polkit_present:

-            reply_handler(

-                action_id is None or

+            return reply_handler(action_id is None or

                 self.__dbus_system_bus_name_uid(system_bus_name) == 0)

         flags = 0