diff --git a/src/Payone/Webhook/MessageBus/MessageHandler/NotificationForwardHandler.php b/src/Payone/Webhook/MessageBus/MessageHandler/NotificationForwardHandler.php
index 7d9f6725e..6813952e9 100644
--- a/src/Payone/Webhook/MessageBus/MessageHandler/NotificationForwardHandler.php
+++ b/src/Payone/Webhook/MessageBus/MessageHandler/NotificationForwardHandler.php
@@ -112,7 +112,7 @@ private function getForwardRequests(\CurlMultiHandle $multiHandle, EntitySearchR
 
             $serialize = unserialize($forward->getContent(), []);
             /** @var array<int, string>|string|false $content */
-            $content = mb_convert_encoding((string) $serialize, 'ISO-8859-1', 'UTF-8');
+            $content = mb_convert_encoding($serialize, 'ISO-8859-1', 'UTF-8');
 
             if (!\is_array($content)) {
                 continue;