diff --git a/src/Symfony/Component/Validator/Tests/Validator/RecursiveValidatorTest.php b/src/Symfony/Component/Validator/Tests/Validator/RecursiveValidatorTest.php
index 31871c3f9a1e..484236241c7f 100644
--- a/src/Symfony/Component/Validator/Tests/Validator/RecursiveValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Validator/RecursiveValidatorTest.php
@@ -19,6 +19,8 @@
 use Symfony\Component\Validator\Constraints\Length;
 use Symfony\Component\Validator\Constraints\NotBlank;
 use Symfony\Component\Validator\Constraints\NotNull;
+use Symfony\Component\Validator\Constraints\Optional;
+use Symfony\Component\Validator\Constraints\Required;
 use Symfony\Component\Validator\ConstraintValidatorFactory;
 use Symfony\Component\Validator\Context\ExecutionContextFactory;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
@@ -157,4 +159,18 @@ public function testAllConstraintValidateAllGroupsForNestedConstraints()
         $this->assertInstanceOf(NotBlank::class, $violations->get(0)->getConstraint());
         $this->assertInstanceOf(Length::class, $violations->get(1)->getConstraint());
     }
+
+    public function testRequiredConstraintIsIgnored()
+    {
+        $violations = $this->validator->validate([], new Required());
+
+        $this->assertCount(0, $violations);
+    }
+
+    public function testOptionalConstraintIsIgnored()
+    {
+        $violations = $this->validator->validate([], new Optional());
+
+        $this->assertCount(0, $violations);
+    }
 }
diff --git a/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php b/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
index a204cd91f619..24206bfc27d9 100644
--- a/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
+++ b/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
@@ -13,6 +13,7 @@
 
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\Constraints\Composite;
+use Symfony\Component\Validator\Constraints\Existence;
 use Symfony\Component\Validator\Constraints\GroupSequence;
 use Symfony\Component\Validator\Constraints\Valid;
 use Symfony\Component\Validator\ConstraintValidatorFactoryInterface;
@@ -790,6 +791,10 @@ private function validateInGroup($value, $cacheKey, MetadataInterface $metadata,
         $context->setGroup($group);
 
         foreach ($metadata->findConstraints($group) as $constraint) {
+            if ($constraint instanceof Existence) {
+                continue;
+            }
+
             // Prevent duplicate validation of constraints, in the case
             // that constraints belong to multiple validated groups
             if (null !== $cacheKey) {