diff --git a/src/upload/system/library/retailcrm/lib/service/OrderManager.php b/src/upload/system/library/retailcrm/lib/service/OrderManager.php
index 74851af..fe80f76 100644
--- a/src/upload/system/library/retailcrm/lib/service/OrderManager.php
+++ b/src/upload/system/library/retailcrm/lib/service/OrderManager.php
@@ -39,7 +39,10 @@ class OrderManager {
     public function createOrder($order_data, $order_products, $order_totals) {
         $order = $this->prepareOrder($order_data, $order_products, $order_totals);
 
-        if (!isset($order['customer'])) {
+        if (!isset($order['customer'])
+            || (isset($order['customer']['externalId'])
+                && !$this->checkExistCustomer($order['customer']['externalId']))
+        ) {
             $customer = $this->customer_manager->getCustomerForOrder($order_data);
             if (!empty($customer)) {
                 $order['customer'] = $customer;
@@ -167,4 +170,15 @@ class OrderManager {
             $this->api->ordersPaymentEdit($order_payment);
         }
     }
+
+    /**
+     * @param string $customerExternalId Customer's external id
+     *
+     * @return bool
+     */
+    private function checkExistCustomer($customerExternalId) {
+        $result = $this->api->customersGet($customerExternalId);
+
+        return $result && $result->isSuccessful() && $result->offsetExists('customer');
+    }
 }
diff --git a/tests/system/lib/service/OrderManagerTest.php b/tests/system/lib/service/OrderManagerTest.php
index dd809b9..0eb06fc 100644
--- a/tests/system/lib/service/OrderManagerTest.php
+++ b/tests/system/lib/service/OrderManagerTest.php
@@ -10,11 +10,32 @@ class OrderManagerTest extends TestCase {
     public function testCreateOrderWithCustomer() {
         $proxy = $this->getMockBuilder(\RetailcrmProxy::class)
             ->disableOriginalConstructor()
-            ->setMethods(['ordersCreate'])
+            ->setMethods(['ordersCreate','customersGet'])
             ->getMock();
 
         $proxy->expects($this->once())->method('ordersCreate');
 
+        $proxy->expects($this->once())
+            ->method('customersGet')
+            ->willReturn(new \RetailcrmApiResponse(
+                200,
+                json_encode(
+                    [
+                        'success' => true,
+                        'pagination' => [
+                            'limit'=> 20,
+                            'totalCount' => 0,
+                            'currentPage' => 1,
+                            'totalPageCount' => 0
+                        ],
+                        'customer' => [
+                            'id' => 1,
+                            'externalId' => 1
+                        ]
+                    ]
+                )
+            ));
+
         $order_manager = $this->getOrderManager($proxy);
 
         $orderCheckoutModel = $this->loadModel('checkout/order');