diff --git a/src/State/Processor/ObjectMapperProcessor.php b/src/State/Processor/ObjectMapperProcessor.php
index cfb13766f42..67511e67cea 100644
--- a/src/State/Processor/ObjectMapperProcessor.php
+++ b/src/State/Processor/ObjectMapperProcessor.php
@@ -38,6 +38,7 @@ public function process(mixed $data, Operation $operation, array $uriVariables =
         if (
             !$this->objectMapper
             || !$operation->canWrite()
+            || null === $data
             || !is_a($data, $operation->getClass(), true)
             || !(new \ReflectionClass($operation->getClass()))->getAttributes(Map::class)
         ) {
diff --git a/src/State/Tests/Processor/ObjectMapperProcessorTest.php b/src/State/Tests/Processor/ObjectMapperProcessorTest.php
new file mode 100644
index 00000000000..514a153cdfd
--- /dev/null
+++ b/src/State/Tests/Processor/ObjectMapperProcessorTest.php
@@ -0,0 +1,107 @@
+<?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\State\Tests\Processor;
+
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\Metadata\Post;
+use ApiPlatform\State\Processor\ObjectMapperProcessor;
+use ApiPlatform\State\ProcessorInterface;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\ObjectMapper\Attribute\Map;
+use Symfony\Component\ObjectMapper\ObjectMapperInterface;
+
+class ObjectMapperProcessorTest extends TestCase
+{
+    public function testProcessBypassesWhenNoObjectMapper(): void
+    {
+        $data = new DummyResourceWithoutMap();
+        $operation = new Post(class: DummyResourceWithoutMap::class);
+        $decorated = $this->createMock(ProcessorInterface::class);
+        $decorated->expects($this->once())
+            ->method('process')
+            ->with($data, $operation, [], [])
+            ->willReturn($data);
+
+        $processor = new ObjectMapperProcessor(null, $decorated);
+        $this->assertEquals($data, $processor->process($data, $operation));
+    }
+
+    public function testProcessBypassesOnNonWriteOperation(): void
+    {
+        $data = new DummyResourceWithoutMap();
+        $operation = new Get(class: DummyResourceWithoutMap::class);
+        $objectMapper = $this->createMock(ObjectMapperInterface::class);
+        $decorated = $this->createMock(ProcessorInterface::class);
+        $decorated->expects($this->once())
+            ->method('process')
+            ->with($data, $operation, [], [])
+            ->willReturn($data);
+
+        $processor = new ObjectMapperProcessor($objectMapper, $decorated);
+        $this->assertEquals($data, $processor->process($data, $operation));
+    }
+
+    public function testProcessBypassesWithNullData(): void
+    {
+        $operation = new Post(class: DummyResourceWithoutMap::class);
+        $objectMapper = $this->createMock(ObjectMapperInterface::class);
+        $decorated = $this->createMock(ProcessorInterface::class);
+        $decorated->expects($this->once())
+            ->method('process')
+            ->with(null, $operation, [], [])
+            ->willReturn(null);
+
+        $processor = new ObjectMapperProcessor($objectMapper, $decorated);
+        $this->assertNull($processor->process(null, $operation));
+    }
+
+    public function testProcessBypassesWithMismatchedDataType(): void
+    {
+        $data = new \stdClass();
+        $operation = new Post(class: DummyResourceWithMap::class);
+        $objectMapper = $this->createMock(ObjectMapperInterface::class);
+        $decorated = $this->createMock(ProcessorInterface::class);
+        $decorated->expects($this->once())
+            ->method('process')
+            ->with($data, $operation, [], [])
+            ->willReturn($data);
+
+        $processor = new ObjectMapperProcessor($objectMapper, $decorated);
+        $this->assertEquals($data, $processor->process($data, $operation));
+    }
+
+    public function testProcessBypassesWithoutMapAttribute(): void
+    {
+        $data = new DummyResourceWithoutMap();
+        $operation = new Post(class: DummyResourceWithoutMap::class);
+        $objectMapper = $this->createMock(ObjectMapperInterface::class);
+        $decorated = $this->createMock(ProcessorInterface::class);
+        $decorated->expects($this->once())
+            ->method('process')
+            ->with($data, $operation, [], [])
+            ->willReturn($data);
+
+        $processor = new ObjectMapperProcessor($objectMapper, $decorated);
+        $this->assertEquals($data, $processor->process($data, $operation));
+    }
+}
+
+class DummyResourceWithoutMap
+{
+}
+
+#[Map]
+class DummyResourceWithMap
+{
+}
diff --git a/src/State/composer.json b/src/State/composer.json
index bb7f0c234de..020640c8e17 100644
--- a/src/State/composer.json
+++ b/src/State/composer.json
@@ -35,11 +35,12 @@
         "symfony/translation-contracts": "^3.0"
     },
     "require-dev": {
-        "api-platform/validator": "^4.1",
         "api-platform/serializer": "^4.1",
-        "symfony/type-info": "^7.3",
+        "api-platform/validator": "^4.1",
         "phpunit/phpunit": "11.5.x-dev",
         "symfony/http-foundation": "^6.4 || ^7.0",
+        "symfony/object-mapper": "^7.3",
+        "symfony/type-info": "^7.3",
         "symfony/web-link": "^6.4 || ^7.1",
         "willdurand/negotiation": "^3.1"
     },