diff --git a/Model/SendinblueSib.php b/Model/SendinblueSib.php
index 348cc15..e573949 100755
--- a/Model/SendinblueSib.php
+++ b/Model/SendinblueSib.php
@@ -1528,7 +1528,7 @@ public function getNewsletterUnSubscribeCount()
     public function checkPortStatus()
     {
         try {
-            $relay_port_status = fsockopen(‘smtp-relay.sendinblue.com’, 587);
+            $relay_port_status = fsockopen('smtp-relay.sendinblue.com', 587);
             if (!$relay_port_status) {
                 return 0;
             }
diff --git a/Model/SendinblueSibClient.php b/Model/SendinblueSibClient.php
index a7c1563..97156fb 100755
--- a/Model/SendinblueSibClient.php
+++ b/Model/SendinblueSibClient.php
@@ -23,7 +23,7 @@ public function __construct($key = "")
         if( empty($key) ) {
             $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
             $model = $objectManager->create('Sendinblue\Sendinblue\Model\SendinblueSib');
-            $this->apiKey = trim($model->_getValueDefault->getValue('sendinblue/api_key_v3', $model->_scopeTypeDefault));            
+            $this->apiKey = trim((string) $model->_getValueDefault->getValue('sendinblue/api_key_v3', $model->_scopeTypeDefault));
         }
         else {
             $this->apiKey = trim($key);