symfony
diff --git a/‎src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php
+4Lines changed: 4 additions & 0 deletions b/‎src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraints/ExpressionLanguageSyntaxValidator.php
+4Lines changed: 4 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php
+14Lines changed: 14 additions & 0 deletions b/‎src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Tests/Constraints/ExpressionLanguageSyntaxValidatorTest.php
+14Lines changed: 14 additions & 0 deletions
@@ -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');
         }
 
@@ -65,4 +65,18 @@ public function testExpressionIsNotValid()
             ->setCode(ExpressionLanguageSyntax::EXPRESSION_LANGUAGE_SYNTAX_ERROR)
             ->assertRaised();
     }
+
+    public function testNullIsValid()
+    {
+        $this->validator->validate(null, new ExpressionLanguageSyntax());
+
+        $this->assertNoViolation();
+    }
+
+    public function testEmptyIsValid()
+    {
+        $this->validator->validate('', new ExpressionLanguageSyntax());
+
+        $this->assertNoViolation();
+    }
 }
Original file line number	Diff line number	Diff line change
`@@ -39,6 +39,10 @@ public function validate($expression, Constraint $constraint): void`
`39`	`39`	`throw new UnexpectedTypeException($constraint, ExpressionLanguageSyntax::class);`
`40`	`40`	`}`
`41`	`41`
	`42`	`+ if (null === $expression \|\| '' === $expression) {`
	`43`	`+ return;`
	`44`	`+ }`
	`45`	`+`
`42`	`46`	`if (!\is_string($expression)) {`
`43`	`47`	`throw new UnexpectedValueException($expression, 'string');`
`44`	`48`	`}`