diff --git a/features/bootstrap/DoctrineContext.php b/features/bootstrap/DoctrineContext.php
index 5f6c1b168f0..e9d5b43f050 100644
--- a/features/bootstrap/DoctrineContext.php
+++ b/features/bootstrap/DoctrineContext.php
@@ -78,6 +78,8 @@
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\ConvertedRelated;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\ConvertedString;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\Customer;
+use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\DisableItemOperation;
+use ApiPlatform\Core\Tests\Fixtures\TestBundle\Document\DisableItemOperation as DisableItemOperationDocument;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\Dummy;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\DummyAggregateOffer;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\DummyCar;
@@ -1484,6 +1486,17 @@ public function thereAreConvertedOwnerObjects(int $nb)
         $this->manager->flush();
     }
 
+    /**
+     * @Given there is 1 DisableItemOperation
+     */
+    public function thereIsOneDisableItemOperation()
+    {
+        $item = $this->buildDisableItemOperation();
+        $item->name = 'Test';
+        $this->manager->persist($item);
+        $this->manager->flush();
+    }
+
     private function isOrm(): bool
     {
         return null !== $this->schemaTool;
@@ -1853,4 +1866,12 @@ private function buildConvertedRelated()
     {
         return $this->isOrm() ? new ConvertedRelated() : new ConvertedRelatedDocument();
     }
+
+    /**
+     * @return DisableItemOperation|DisableItemOperationDocument
+     */
+    private function buildDisableItemOperation()
+    {
+        return $this->isOrm() ? new DisableItemOperation() : new DisableItemOperationDocument();
+    }
 }
diff --git a/features/main/operation.feature b/features/main/operation.feature
index b81805498ea..b4c71a0520e 100644
--- a/features/main/operation.feature
+++ b/features/main/operation.feature
@@ -55,3 +55,9 @@ Feature: Operation support
         }
     }
     """
+
+  @createSchema
+  Scenario: Get a resource that doesn't have a defined item operation
+    Given there is 1 DisableItemOperation
+    When I send a "GET" request to "/disable_item_operations"
+    Then the response status code should be 200
diff --git a/src/JsonLd/Serializer/ItemNormalizer.php b/src/JsonLd/Serializer/ItemNormalizer.php
index aca10e346d7..2d2efbba6d8 100644
--- a/src/JsonLd/Serializer/ItemNormalizer.php
+++ b/src/JsonLd/Serializer/ItemNormalizer.php
@@ -15,6 +15,7 @@
 
 use ApiPlatform\Core\Api\IriConverterInterface;
 use ApiPlatform\Core\Api\ResourceClassResolverInterface;
+use ApiPlatform\Core\Exception\InvalidArgumentException;
 use ApiPlatform\Core\JsonLd\ContextBuilderInterface;
 use ApiPlatform\Core\Metadata\Property\Factory\PropertyMetadataFactoryInterface;
 use ApiPlatform\Core\Metadata\Property\Factory\PropertyNameCollectionFactoryInterface;
@@ -71,7 +72,13 @@ public function normalize($object, $format = null, array $context = [])
 
         $resourceClass = $this->resourceClassResolver->getResourceClass($object, $context['resource_class'] ?? null);
         $context = $this->initContext($resourceClass, $context);
-        $iri = $this->iriConverter->getIriFromItem($object);
+
+        try {
+            $iri = $this->iriConverter->getIriFromItem($object);
+        } catch (InvalidArgumentException $e) {
+            $iri = '_:'.(\function_exists('spl_object_id') ? spl_object_id($object) : spl_object_hash($object));
+        }
+
         $context['iri'] = $iri;
         $context['api_normalize'] = true;
 
diff --git a/tests/Fixtures/TestBundle/Document/DisableItemOperation.php b/tests/Fixtures/TestBundle/Document/DisableItemOperation.php
new file mode 100644
index 00000000000..51af135ba06
--- /dev/null
+++ b/tests/Fixtures/TestBundle/Document/DisableItemOperation.php
@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Core\Tests\Fixtures\TestBundle\Document;
+
+use ApiPlatform\Core\Annotation\ApiResource;
+use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+
+/**
+ * DisableItemOperation.
+ *
+ * @author Antoine Bluchet <soyuka@gmail.com>
+ *
+ * @ApiResource(itemOperations={}, collectionOperations={"get"})
+ * @ODM\Document
+ */
+class DisableItemOperation
+{
+    /**
+     * @ODM\Id(strategy="INCREMENT", type="integer")
+     */
+    private $id;
+
+    /**
+     * @var string The dummy name
+     *
+     * @ODM\Field
+     */
+    public $name;
+
+    public function getId() {
+        return $this->id;
+    }
+}
diff --git a/tests/Fixtures/TestBundle/Entity/DisableItemOperation.php b/tests/Fixtures/TestBundle/Entity/DisableItemOperation.php
new file mode 100644
index 00000000000..7d53109234d
--- /dev/null
+++ b/tests/Fixtures/TestBundle/Entity/DisableItemOperation.php
@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity;
+
+use ApiPlatform\Core\Annotation\ApiResource;
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * DisableItemOperation.
+ *
+ * @author Antoine Bluchet <soyuka@gmail.com>
+ *
+ * @ApiResource(itemOperations={}, collectionOperations={"get", "post"})
+ * @ORM\Entity
+ */
+class DisableItemOperation
+{
+    /**
+     * @var int The id
+     *
+     * @ORM\Column(type="integer", nullable=true)
+     * @ORM\Id
+     * @ORM\GeneratedValue(strategy="AUTO")
+     */
+    private $id;
+
+    /**
+     * @var string The dummy name
+     *
+     * @ORM\Column
+     */
+    public $name;
+
+    public function getId() {
+        return $this->id;
+    }
+}