diff --git a/Mapping/PropertyMetadata.php b/Mapping/PropertyMetadata.php
index 74ecf02cf..2a8d3f4f5 100644
--- a/Mapping/PropertyMetadata.php
+++ b/Mapping/PropertyMetadata.php
@@ -48,7 +48,13 @@ public function __construct(string $class, string $name)
      */
     public function getPropertyValue($object)
     {
-        return $this->getReflectionMember($object)->getValue($object);
+        $reflProperty = $this->getReflectionMember($object);
+
+        if (\PHP_VERSION_ID >= 70400 && !$reflProperty->isInitialized($object)) {
+            return null;
+        }
+
+        return $reflProperty->getValue($object);
     }
 
     /**
diff --git a/Tests/Fixtures/Entity_74.php b/Tests/Fixtures/Entity_74.php
new file mode 100644
index 000000000..cb22fb7f7
--- /dev/null
+++ b/Tests/Fixtures/Entity_74.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Symfony\Component\Validator\Tests\Fixtures;
+
+class Entity_74
+{
+    public int $uninitialized;
+}
diff --git a/Tests/Mapping/PropertyMetadataTest.php b/Tests/Mapping/PropertyMetadataTest.php
index 790262521..8d9e67881 100644
--- a/Tests/Mapping/PropertyMetadataTest.php
+++ b/Tests/Mapping/PropertyMetadataTest.php
@@ -14,10 +14,12 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Validator\Mapping\PropertyMetadata;
 use Symfony\Component\Validator\Tests\Fixtures\Entity;
+use Symfony\Component\Validator\Tests\Fixtures\Entity_74;
 
 class PropertyMetadataTest extends TestCase
 {
     const CLASSNAME = 'Symfony\Component\Validator\Tests\Fixtures\Entity';
+    const CLASSNAME_74 = 'Symfony\Component\Validator\Tests\Fixtures\Entity_74';
     const PARENTCLASS = 'Symfony\Component\Validator\Tests\Fixtures\EntityParent';
 
     public function testInvalidPropertyName()
@@ -53,4 +55,15 @@ public function testGetPropertyValueFromRemovedProperty()
         $this->expectException('Symfony\Component\Validator\Exception\ValidatorException');
         $metadata->getPropertyValue($entity);
     }
+
+    /**
+     * @requires PHP 7.4
+     */
+    public function testGetPropertyValueFromUninitializedProperty()
+    {
+        $entity = new Entity_74();
+        $metadata = new PropertyMetadata(self::CLASSNAME_74, 'uninitialized');
+
+        $this->assertNull($metadata->getPropertyValue($entity));
+    }
 }