diff --git a/craftgate-payment-gateway.php b/craftgate-payment-gateway.php
index c448f0a..7b315da 100644
--- a/craftgate-payment-gateway.php
+++ b/craftgate-payment-gateway.php
@@ -5,7 +5,7 @@
  * Description: Accept debit/credit card payments easily and directly on your WordPress site using Craftgate.
  * Author: Craftgate
  * Author URI: https://craftgate.io/
- * Version: 1.0.7
+ * Version: 1.0.8
  * Requires at least: 4.4
  * Tested up to: 6.0
  * WC requires at least: 3.0.0
@@ -380,7 +380,7 @@ private function retrieve_card_user_key($customer_id, $api_key)
             );
 
             $result = $wpdb->get_col($query);
-            if ($result[0]) {
+            if (isset($result[0])) {
                 return $result[0];
             } else {
                 return null;
diff --git a/includes/lib/craftgate/src/Adapter/BaseAdapter.php b/includes/lib/craftgate/src/Adapter/BaseAdapter.php
index eeaed0a..4f953c2 100644
--- a/includes/lib/craftgate/src/Adapter/BaseAdapter.php
+++ b/includes/lib/craftgate/src/Adapter/BaseAdapter.php
@@ -55,7 +55,7 @@ private function prepareHeaders($path, $request = null)
             'content-type: application/json'
         );
 
-        if ($GLOBALS["cg-lang-header"]) {
+        if (isset($GLOBALS["cg-lang-header"])) {
             $headers[] = 'lang: ' . $GLOBALS["cg-lang-header"];
         }
 
diff --git a/readme.txt b/readme.txt
index be3066d..9e994fa 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Tags: craftgate, payment gateway, kredi kartı, banka kartı, ödeme, sanal pos,
 Requires at least: 4.4
 Tested up to: 6.0
 Requires PHP: 5.6
-Stable tag: 1.0.7
+Stable tag: 1.0.8
 License: GPLv3
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
 
@@ -63,6 +63,9 @@ Craftgate kullanarak ödeme geçirebilmek için üyeliğinizin olması gerekmekt
 6. Sipariş Yönetim Sayfası
 
 == Changelog ==
+= 1.0.8 - 2026-12-26 =
+* Add additional checks for nullable fields
+
 = 1.0.7 - 2022-11-09 =
 * updates wordpress and woocommerce versions