diff --git a/src/include/abstracts/class-wc-retailcrm-abstracts-settings.php b/src/include/abstracts/class-wc-retailcrm-abstracts-settings.php
index a95f362..fdb66c3 100644
--- a/src/include/abstracts/class-wc-retailcrm-abstracts-settings.php
+++ b/src/include/abstracts/class-wc-retailcrm-abstracts-settings.php
@@ -183,7 +183,7 @@ abstract class WC_Retailcrm_Abstracts_Settings extends WC_Integration
                 $order_methods_option = array();
                 $order_methods_list = $this->apiClient->orderMethodsList();
 
-                if ($order_methods_list->isSuccessful()) {
+                if (!empty($order_methods_list) && $order_methods_list->isSuccessful()) {
                     foreach ($order_methods_list['orderMethods'] as $order_method) {
                         if ($order_method['active'] == false) {
                             continue;
@@ -217,7 +217,7 @@ abstract class WC_Retailcrm_Abstracts_Settings extends WC_Integration
                 $shipping_option_list = array();
                 $retailcrm_shipping_list = $this->apiClient->deliveryTypesList();
 
-                if ($retailcrm_shipping_list->isSuccessful()) {
+                if (!empty($retailcrm_shipping_list) && $retailcrm_shipping_list->isSuccessful()) {
                     foreach ($retailcrm_shipping_list['deliveryTypes'] as $retailcrm_shipping_type) {
                         $shipping_option_list[$retailcrm_shipping_type['code']] = $retailcrm_shipping_type['name'];
                     }
@@ -252,7 +252,7 @@ abstract class WC_Retailcrm_Abstracts_Settings extends WC_Integration
                 $payment_option_list = array();
                 $retailcrm_payment_list = $this->apiClient->paymentTypesList();
 
-                if ($retailcrm_payment_list->isSuccessful()) {
+                if (!empty($retailcrm_payment_list) && $retailcrm_payment_list->isSuccessful()) {
                     foreach ($retailcrm_payment_list['paymentTypes'] as $retailcrm_payment_type) {
                         $payment_option_list[$retailcrm_payment_type['code']] = $retailcrm_payment_type['name'];
                     }
@@ -285,7 +285,7 @@ abstract class WC_Retailcrm_Abstracts_Settings extends WC_Integration
                 $statuses_option_list = array();
                 $retailcrm_statuses_list = $this->apiClient->statusesList();
 
-                if ($retailcrm_statuses_list->isSuccessful()) {
+                if (!empty($retailcrm_statuses_list) && $retailcrm_statuses_list->isSuccessful()) {
                     foreach ($retailcrm_statuses_list['statuses'] as $retailcrm_status) {
                         $statuses_option_list[$retailcrm_status['code']] = $retailcrm_status['name'];
                     }
@@ -587,7 +587,7 @@ abstract class WC_Retailcrm_Abstracts_Settings extends WC_Integration
 
         $response = $api->apiVersions();
 
-        if ($response && $response->isSuccessful()) {
+        if (!empty($response) && $response->isSuccessful()) {
             if (!in_array($versionMap[$value], $response['versions'])) {
                 WC_Admin_Settings::add_error( esc_html__( 'The selected API version is unavailable', 'retailcrm' ) );
                 $value = '';
diff --git a/src/include/api/class-wc-retailcrm-proxy.php b/src/include/api/class-wc-retailcrm-proxy.php
index 6be9439..54450b3 100644
--- a/src/include/api/class-wc-retailcrm-proxy.php
+++ b/src/include/api/class-wc-retailcrm-proxy.php
@@ -47,7 +47,7 @@ if ( ! class_exists( 'WC_Retailcrm_Proxy' ) ) :
             try {
                 $response = call_user_func_array(array($this->retailcrm, $method), $arguments);
 
-                if ($response->isSuccessful()) {
+                if (!empty($response) && $response->isSuccessful()) {
                     $result = ' Ok';
                 } else {
                     $result = sprintf(
diff --git a/src/include/class-wc-retailcrm-base.php b/src/include/class-wc-retailcrm-base.php
index 66d6199..4cecfa1 100644
--- a/src/include/class-wc-retailcrm-base.php
+++ b/src/include/class-wc-retailcrm-base.php
@@ -249,9 +249,9 @@ if (!class_exists('WC_Retailcrm_Base')) {
             }
 
             $wcCustomer = new WC_Customer($customer_id);
-            $resp = $client->customersList(array('email' => $wcCustomer->get_billing_email()));
+            $response = $client->customersList(array('email' => $wcCustomer->get_billing_email()));
 
-            if ($resp && $resp->isSuccessful() && isset($resp['customers']) && count($resp['customers']) > 0) {
+            if ((!empty($response) && $response->isSuccessful()) && isset($response['customers']) && count($response['customers']) > 0) {
                 return;
             }
 
diff --git a/src/include/class-wc-retailcrm-customers.php b/src/include/class-wc-retailcrm-customers.php
index cde4f45..eecc736 100644
--- a/src/include/class-wc-retailcrm-customers.php
+++ b/src/include/class-wc-retailcrm-customers.php
@@ -102,7 +102,7 @@ if (!class_exists('WC_Retailcrm_Customers')) :
                 $this->processCustomer($customer);
                 $response = $this->retailcrm->customersCreate($this->customer);
 
-                if ($response->isSuccessful() && isset($response['id'])) {
+                if ((!empty($response) && $response->isSuccessful()) && isset($response['id'])) {
                     return $response['id'];
                 }
             }
@@ -182,7 +182,7 @@ if (!class_exists('WC_Retailcrm_Customers')) :
                 $search = $this->retailcrm->customersList(array('email' => $filter['email']));
             }
 
-            if ($search->isSuccessful()) {
+            if (!empty($search) && $search->isSuccessful()) {
                 if (isset($search['customers'])) {
                     if (empty($search['customers'])) {
                         return false;
diff --git a/src/include/class-wc-retailcrm-history.php b/src/include/class-wc-retailcrm-history.php
index 2101e2c..900329c 100644
--- a/src/include/class-wc-retailcrm-history.php
+++ b/src/include/class-wc-retailcrm-history.php
@@ -89,7 +89,7 @@ if ( ! class_exists( 'WC_Retailcrm_History' ) ) :
                 $response = $this->retailcrm->customersHistory(array('startDate' => $date));
             }
 
-            if ($response->isSuccessful()) {
+            if (!empty($response) && $response->isSuccessful()) {
                 if (empty($response['history'])) {
                     return;
                 }
@@ -190,7 +190,7 @@ if ( ! class_exists( 'WC_Retailcrm_History' ) ) :
                 $response = $this->retailcrm->ordersHistory(array('startDate' => $date));
             }
 
-            if ($response->isSuccessful()) {
+            if (!empty($response) && $response->isSuccessful()) {
                 if (empty($response['history'])) {
                     return false;
                 }
@@ -696,9 +696,11 @@ if ( ! class_exists( 'WC_Retailcrm_History' ) ) :
             $order_items = array();
             if ($event == 'update') {
                 $result = $this->retailcrm->ordersGet($order['externalId']);
-                if ($result->isSuccessful()) {
+
+                if (!empty($result) && $result->isSuccessful()) {
                     $orderCrm = $result['order'];
                 }
+
                 $data = $orderCrm;
             }
 
diff --git a/src/include/class-wc-retailcrm-orders.php b/src/include/class-wc-retailcrm-orders.php
index 3c242c7..6923015 100644
--- a/src/include/class-wc-retailcrm-orders.php
+++ b/src/include/class-wc-retailcrm-orders.php
@@ -118,6 +118,7 @@ if ( ! class_exists( 'WC_Retailcrm_Orders' ) ) :
          * @param $order_id
          *
          * @return mixed
+         * @throws Exception
          */
         public function orderCreate($order_id)
         {
@@ -202,7 +203,7 @@ if ( ! class_exists( 'WC_Retailcrm_Orders' ) ) :
 
             $response = $this->retailcrm->ordersEdit($this->order);
 
-            if ($response->isSuccessful() && $this->retailcrm_settings['api_version'] == 'v5') {
+            if ((!empty($response) && $response->isSuccessful()) && $this->retailcrm_settings['api_version'] == 'v5') {
                 $this->payment = $this->orderUpdatePaymentType($order);
             }
 
@@ -224,7 +225,7 @@ if ( ! class_exists( 'WC_Retailcrm_Orders' ) ) :
 
             $response = $this->retailcrm->ordersGet($order->get_id());
 
-            if ($response->isSuccessful()) {
+            if (!empty($response) && $response->isSuccessful()) {
                 $retailcrmOrder = $response['order'];
 
                 foreach ($retailcrmOrder['payments'] as $payment_data) {
@@ -245,7 +246,7 @@ if ( ! class_exists( 'WC_Retailcrm_Orders' ) ) :
             if (isset($payment) && $payment['type'] != $this->retailcrm_settings[$order->get_payment_method()]) {
                 $response = $this->retailcrm->ordersPaymentDelete($payment['id']);
 
-                if ($response->isSuccessful()) {
+                if (!empty($response) && $response->isSuccessful()) {
                     $payment = $this->sendPayment($order);
 
                     return $payment;
diff --git a/src/include/class-wc-retailcrm-plugin.php b/src/include/class-wc-retailcrm-plugin.php
index 089effe..f78c62e 100644
--- a/src/include/class-wc-retailcrm-plugin.php
+++ b/src/include/class-wc-retailcrm-plugin.php
@@ -120,7 +120,7 @@ class WC_Retailcrm_Plugin {
             return false;
         }
 
-        if ($response->isSuccessful()) {
+        if (!empty($response) && $response->isSuccessful()) {
             return true;
         }
 
@@ -137,3 +137,4 @@ class WC_Retailcrm_Plugin {
         return self::$history_run;
     }
 }
+
diff --git a/tests/test-wc-retailcrm-customers.php b/tests/test-wc-retailcrm-customers.php
index 86320e0..0b1ab89 100644
--- a/tests/test-wc-retailcrm-customers.php
+++ b/tests/test-wc-retailcrm-customers.php
@@ -122,6 +122,21 @@ class WC_Retailcrm_Customers_Test extends WC_Retailcrm_Test_Case_Helper
         }
     }
 
+    /**
+     * @param $retailcrm
+     * @dataProvider dataProviderApiClient
+     */
+    public function test_create_customer_empty_response($retailcrm)
+    {
+        $this->responseMock = null;
+        $this->apiMock = null;
+        
+        $retailcrm_customer = $this->getRetailcrmCustomer($retailcrm);
+        $id = $retailcrm_customer->createCustomer($this->customer->get_id());
+
+        $this->assertEquals(null, $id);
+    }
+
     public function dataProviderApiClient()
     {
         $this->setUp();