diff --git a/function/rooms.py b/function/rooms.py
index a63de5b..1baeffc 100644
--- a/function/rooms.py
+++ b/function/rooms.py
@@ -44,8 +44,11 @@ class room_collection(object):
             # attribute name is not private
             if not sub_name.startswith("__"):
                 sub = getattr(self, sub_name)
-                if sub.__class__.__bases__[0].__name__ in self.ALLOWED_CLASSES:
+                # try to call all_off
+                try:
                     sub.all_off()
+                except AttributeError:
+                    pass    # don't mind, if sub has no method all_off
 
     def summer_mode(self, device=None, key=None, data=None):
         logger.info("Changing to %s \"%s\"", "summer mode" if data else "winter_mode", type(self).__name__)