diff --git a/src/lib/SubscriptionResolver/ConfigBasedSubscriptionResolver.php b/src/lib/SubscriptionResolver/ConfigBasedSubscriptionResolver.php
index 46592c3..6cdaabc 100644
--- a/src/lib/SubscriptionResolver/ConfigBasedSubscriptionResolver.php
+++ b/src/lib/SubscriptionResolver/ConfigBasedSubscriptionResolver.php
@@ -27,7 +27,7 @@ public function resolve(NotificationInterface $notification, array $context = []
         $notificationType = $notification->getType();
 
         if (!array_key_exists($notificationType, $config)) {
-            yield;
+            return;
         }
 
         foreach ($config[$notificationType]['channels'] as $channel) {