diff --git a/Model/Config/System/ConnectionRepository.php b/Model/Config/System/ConnectionRepository.php
index cdc6f8e..b3459e3 100644
--- a/Model/Config/System/ConnectionRepository.php
+++ b/Model/Config/System/ConnectionRepository.php
@@ -114,11 +114,8 @@ private function getCacheEncryptionKey(?int $storeId = null): ?string
     {
         $path = self::XML_PATH_CACHE_ENCRYPTION_KEY;
         $value = $this->getStoreValue($path, $storeId);
-        if (is_string($value)) {
-            if ($value) {
-                return $this->encryptor->decrypt($value);
-            }
-            return '';
+        if (!empty($value)) {
+            return $this->encryptor->decrypt($value);
         }
         return null;
     }