diff --git a/src/Controller/WatchListController.php b/src/Controller/WatchListController.php
index 5647d23..4a47e30 100644
--- a/src/Controller/WatchListController.php
+++ b/src/Controller/WatchListController.php
@@ -157,8 +157,9 @@ class WatchListController extends AbstractController
 
     private function verifyWebhookDSN(WatchList $watchList): void
     {
-        if (null !== $watchList->getWebhookDsn()) {
-            foreach ($watchList->getWebhookDsn() as $dsnString) {
+        $webhookDsn = $watchList->getWebhookDsn();
+        if (null !== $webhookDsn && 0 !== count($webhookDsn)) {
+            foreach ($webhookDsn as $dsnString) {
                 try {
                     $dsn = new Dsn($dsnString);
                 } catch (InvalidArgumentException $exception) {
diff --git a/src/MessageHandler/ProcessDomainTriggerHandler.php b/src/MessageHandler/ProcessDomainTriggerHandler.php
index ff67db6..db7df13 100644
--- a/src/MessageHandler/ProcessDomainTriggerHandler.php
+++ b/src/MessageHandler/ProcessDomainTriggerHandler.php
@@ -133,8 +133,9 @@ final readonly class ProcessDomainTriggerHandler
      */
     private function sendChatNotification(WatchList $watchList, ChatNotificationInterface $notification): void
     {
-        if (null !== $watchList->getWebhookDsn()) {
-            foreach ($watchList->getWebhookDsn() as $dsnString) {
+        $webhookDsn = $watchList->getWebhookDsn();
+        if (null !== $webhookDsn && 0 !== count($webhookDsn)) {
+            foreach ($webhookDsn as $dsnString) {
                 $dsn = new Dsn($dsnString);
 
                 $scheme = $dsn->getScheme();