diff --git a/lib/tfw/event_handler_base.py b/lib/tfw/event_handler_base.py
index 04bcaf4..6f9819b 100644
--- a/lib/tfw/event_handler_base.py
+++ b/lib/tfw/event_handler_base.py
@@ -55,6 +55,8 @@ class EventHandlerBase(ABC):
         subscribed to 'fsm' will receive 'fsm_update'
         messages as well.
         """
+        if '' in self.keys:
+            return True
         return message['key'] in self.keys
 
     def dispatch_handling(self, message):