diff --git a/app/services/notification_recipient_service.rb b/app/services/notification_recipient_service.rb
index 5d8c3a39af118efc9d1bd05f9887d1411d31f4be..b286cc373bd26318746582372976a05f9ddf234d 100644
--- a/app/services/notification_recipient_service.rb
+++ b/app/services/notification_recipient_service.rb
@@ -85,6 +85,10 @@ module NotificationRecipientService
           end
       end
 
+      def custom_action
+        nil
+      end
+
       protected
 
       def add_participants(user)