diff --git a/app/code/Magento/Catalog/Model/Product/Type/Price.php b/app/code/Magento/Catalog/Model/Product/Type/Price.php
index 0e16080c1fe0c..121bfd836f8bc 100644
--- a/app/code/Magento/Catalog/Model/Product/Type/Price.php
+++ b/app/code/Magento/Catalog/Model/Product/Type/Price.php
@@ -330,7 +330,7 @@ public function getTierPrice($qty, $product)
      */
     protected function _getCustomerGroupId($product)
     {
-        if ($product->getCustomerGroupId()) {
+        if (!is_null($product->getCustomerGroupId())) {
             return $product->getCustomerGroupId();
         }
         return $this->_customerSession->getCustomerGroupId();
diff --git a/app/code/Magento/Catalog/Pricing/Price/GroupPrice.php b/app/code/Magento/Catalog/Pricing/Price/GroupPrice.php
index 0b7eb45d35935..2fd4b52aa5bc9 100644
--- a/app/code/Magento/Catalog/Pricing/Price/GroupPrice.php
+++ b/app/code/Magento/Catalog/Pricing/Price/GroupPrice.php
@@ -76,7 +76,7 @@ public function getValue()
      */
     protected function getCustomerGroupId()
     {
-        if ($this->product->getCustomerGroupId()) {
+        if (!is_null($this->product->getCustomerGroupId())) {
             return (int) $this->product->getCustomerGroupId();
         }
         return (int) $this->customerSession->getCustomerGroupId();
diff --git a/dev/tests/unit/testsuite/Magento/Catalog/Pricing/Price/GroupPriceTest.php b/dev/tests/unit/testsuite/Magento/Catalog/Pricing/Price/GroupPriceTest.php
index af64271e3b099..00ae9c4c71d5f 100644
--- a/dev/tests/unit/testsuite/Magento/Catalog/Pricing/Price/GroupPriceTest.php
+++ b/dev/tests/unit/testsuite/Magento/Catalog/Pricing/Price/GroupPriceTest.php
@@ -173,14 +173,17 @@ public function testGroupPriceCustomerGroupInSession()
 
     /**
      * test get group price, customer group in session
+     *
+     * @param int $customerGroup
+     * @dataProvider dataProviderGroupPriceCustomerGroupInProduct
      */
-    public function testGroupPriceCustomerGroupInProduct()
+    public function testGroupPriceCustomerGroupInProduct($customerGroup)
     {
         $groupPrice = 80;
         $convertedPrice = 56.23;
         $this->productMock->expects($this->exactly(2))
             ->method('getCustomerGroupId')
-            ->will($this->returnValue(3));
+            ->will($this->returnValue($customerGroup));
         $this->productMock->expects($this->once())
             ->method('getResource')
             ->will($this->returnValue($this->productResourceMock));
@@ -204,7 +207,7 @@ public function testGroupPriceCustomerGroupInProduct()
             ->will($this->returnValue(
                 [
                     [
-                        'cust_group' => 3,
+                        'cust_group' => $customerGroup,
                         'website_price' => $groupPrice,
                     ],
                 ]
@@ -217,8 +220,16 @@ public function testGroupPriceCustomerGroupInProduct()
         $this->assertEquals($convertedPrice, $this->groupPrice->getValue());
     }
 
+    public function dataProviderGroupPriceCustomerGroupInProduct()
+    {
+        return [
+            [0],
+            [3],
+        ];
+    }
+
     /**
-     * test get group price, attribut is noy srt
+     * test get group price, attribute is not set
      */
     public function testGroupPriceAttributeIsNotSet()
     {