diff --git a/lib/Controller/EpisodeActionController.php b/lib/Controller/EpisodeActionController.php
index cdefe1f..761979c 100644
--- a/lib/Controller/EpisodeActionController.php
+++ b/lib/Controller/EpisodeActionController.php
@@ -26,7 +26,7 @@ class EpisodeActionController extends Controller {
 	) {
 		parent::__construct($AppName, $request);
 		$this->episodeActionRepository = $episodeActionRepository;
-		$this->userId = $UserId !== null ? $UserId : '';
+		$this->userId = $UserId ?? '';
 		$this->episodeActionSaver = $episodeActionSaver;
 		$this->request = $request;
 	}
diff --git a/lib/Controller/SubscriptionChangeController.php b/lib/Controller/SubscriptionChangeController.php
index 9059aa0..6911973 100644
--- a/lib/Controller/SubscriptionChangeController.php
+++ b/lib/Controller/SubscriptionChangeController.php
@@ -28,7 +28,7 @@ class SubscriptionChangeController extends Controller {
 		parent::__construct($AppName, $request);
 		$this->subscriptionChangeSaver = $subscriptionChangeSaver;
 		$this->subscriptionChangeRepository = $subscriptionChangeRepository;
-		$this->userId = $UserId !== null ? $UserId : '';
+		$this->userId = $UserId ?? '';
 	}
 
 	/**