Remove related products that not exist in map list.

app/code/Magento/RelatedProductGraphQl/Model/Resolver/Batch/AbstractLikedProducts.php

@@ -110,6 +110,10 @@ private function findRelations(array $products, array $loadAttributes, int $link
         //Matching products with related products.
         $relationsData = [];
         foreach ($relations as $productId => $relatedIds) {
+            //Remove related products that not exist in map list.
+            $relatedIds = array_filter($relatedIds, function ($relatedId) use ($relatedProducts) {
+                return isset($relatedProducts[$relatedId]);
+            });
             $relationsData[$productId] = array_map(
                 function ($id) use ($relatedProducts) {
                     return $relatedProducts[$id];

dev/tests/api-functional/testsuite/Magento/GraphQl/RelatedProduct/GetRelatedProductsTest.php

@@ -10,7 +10,7 @@
 use Magento\TestFramework\TestCase\GraphQlAbstract;
 
 /**
- * Get related products test
+ * Test coverage for get related products
  */
 class GetRelatedProductsTest extends GraphQlAbstract
 {
@@ -49,6 +49,40 @@ public function testQueryRelatedProducts()
         self::assertRelatedProducts($relatedProducts);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Catalog/_files/products_related_disabled.php
+     */
+    public function testQueryDisableRelatedProduct()
+    {
+        $productSku = 'simple_with_cross';
+
+        $query = <<<QUERY
+{
+    products(filter: {sku: {eq: "{$productSku}"}})
+    {
+        items {            
+            related_products
+            {
+                sku
+                name
+                url_key
+                created_at
+            }
+        }
+    }
+}
+QUERY;
+        $response = $this->graphQlQuery($query);
+
+        self::assertArrayHasKey('products', $response);
+        self::assertArrayHasKey('items', $response['products']);
+        self::assertCount(1, $response['products']['items']);
+        self::assertArrayHasKey(0, $response['products']['items']);
+        self::assertArrayHasKey('related_products', $response['products']['items'][0]);
+        $relatedProducts = $response['products']['items'][0]['related_products'];
+        self::assertCount(0, $relatedProducts);
+    }
+
     /**
      * @magentoApiDataFixture Magento/Catalog/_files/products_crosssell.php
      */

dev/tests/integration/testsuite/Magento/Catalog/_files/products_related_disabled.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+
+/** @var $product \Magento\Catalog\Model\Product */
+$product = $objectManager->create(\Magento\Catalog\Model\Product::class);
+$product->setTypeId(\Magento\Catalog\Model\Product\Type::TYPE_SIMPLE)
+    ->setAttributeSetId(4)
+    ->setName('Simple Related Product')
+    ->setSku('simple')
+    ->setPrice(10)
+    ->setVisibility(\Magento\Catalog\Model\Product\Visibility::VISIBILITY_BOTH)
+    ->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_DISABLED)
+    ->setWebsiteIds([1])
+    ->setStockData(['qty' => 100, 'is_in_stock' => 1, 'manage_stock' => 1])
+    ->save();
+
+/** @var \Magento\Catalog\Api\Data\ProductLinkInterface $productLink */
+$productLink = $objectManager->create(\Magento\Catalog\Api\Data\ProductLinkInterface::class);
+$productLink->setSku('simple_with_cross');
+$productLink->setLinkedProductSku('simple');
+$productLink->setPosition(1);
+$productLink->setLinkType('related');
+
+$product = $objectManager->create(\Magento\Catalog\Model\Product::class);
+$product->setTypeId(\Magento\Catalog\Model\Product\Type::TYPE_SIMPLE)
+    ->setAttributeSetId(4)
+    ->setName('Simple Product With Related Product')
+    ->setSku('simple_with_cross')
+    ->setPrice(10)
+    ->setVisibility(\Magento\Catalog\Model\Product\Visibility::VISIBILITY_BOTH)
+    ->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED)
+    ->setWebsiteIds([1])
+    ->setStockData(['qty' => 100, 'is_in_stock' => 1, 'manage_stock' => 1])
+    ->setProductLinks([$productLink])
+    ->save();

dev/tests/integration/testsuite/Magento/Catalog/_files/products_related_disabled_rollback.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+
+/** @var \Magento\Framework\Registry $registry */
+$registry = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(\Magento\Framework\Registry::class);
+
+$registry->unregister('isSecureArea');
+$registry->register('isSecureArea', true);
+
+/** @var \Magento\Catalog\Api\ProductRepositoryInterface $productRepository */
+$productRepository = $objectManager->create(\Magento\Catalog\Api\ProductRepositoryInterface::class);
+
+try {
+    $firstProduct = $productRepository->get('simple', false, null, true);
+    $productRepository->delete($firstProduct);
+} catch (\Magento\Framework\Exception\NoSuchEntityException $exception) {
+    //Product already removed
+}
+
+try {
+    $secondProduct = $productRepository->get('simple_with_cross', false, null, true);
+    $productRepository->delete($secondProduct);
+} catch (\Magento\Framework\Exception\NoSuchEntityException $exception) {
+    //Product already removed
+}
+
+$registry->unregister('isSecureArea');
+$registry->register('isSecureArea', false);