diff --git a/src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php b/src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php
index 4b67da2c2be9c..7a3530239c611 100644
--- a/src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php
@@ -39,6 +39,10 @@ public function validate($expression, Constraint $constraint): void
throw new UnexpectedTypeException($constraint, ExpressionLanguageSyntax::class);
}
+ if (null === $expression || '' === $expression) {
+ return;
+ }
+
if (!\is_string($expression)) {
throw new UnexpectedValueException($expression, 'string');
}
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php
index 8cca54ed8a730..e87853129ffe8 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php
@@ -42,6 +42,21 @@ public function testExpressionWithoutNames()
$this->assertNoViolation();
}
+ public function testExpressionEmpty()
+ {
+ $this->validator->validate(null, new ExpressionLanguageSyntax([
+ 'message' => 'myMessage',
+ ]));
+
+ $this->assertNoViolation();
+
+ $this->validator->validate('', new ExpressionLanguageSyntax([
+ 'message' => 'myMessage',
+ ]));
+
+ $this->assertNoViolation();
+ }
+
public function testExpressionWithAllowedVariableName()
{
$this->validator->validate('a + 1', new ExpressionLanguageSyntax([
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