diff --git a/src/include/class-wc-retailcrm-customers.php b/src/include/class-wc-retailcrm-customers.php
index 8592810..2e2c563 100644
--- a/src/include/class-wc-retailcrm-customers.php
+++ b/src/include/class-wc-retailcrm-customers.php
@@ -623,7 +623,7 @@ if (!class_exists('WC_Retailcrm_Customers')) :
         public function isCustomer($user)
         {
             $retailcrmSettings = array();
-            if (array_key_exists('client_roles', $this->retailcrm_settings)) {
+            if (!empty($this->retailcrm_settings) && array_key_exists('client_roles', $this->retailcrm_settings)) {
                 $retailcrmSettings = $this->retailcrm_settings['client_roles'];
             }