diff --git a/src/Symfony/Component/OptionsResolver/OptionsResolver.php b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
index 3fb3c06f92cd9..d1aad4619bc40 100644
--- a/src/Symfony/Component/OptionsResolver/OptionsResolver.php
+++ b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
@@ -532,6 +532,7 @@ public function addNormalizer(string $option, \Closure $normalizer, bool $forceP
}
if ($forcePrepend) {
+ $this->normalizers[$option] = $this->normalizers[$option] ?? [];
array_unshift($this->normalizers[$option], $normalizer);
} else {
$this->normalizers[$option][] = $normalizer;
diff --git a/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php b/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
index 8e3c1d3331cd5..1fa0e54645eec 100644
--- a/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
+++ b/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
@@ -1506,6 +1506,17 @@ public function testForcePrependNormalizerClosure()
$this->assertEquals(['foo' => '2nd-normalized-1st-normalized-bar'], $this->resolver->resolve());
}
+ public function testForcePrependNormalizerForResolverWithoutPreviousNormalizers()
+ {
+ // defined by superclass
+ $this->resolver->setDefault('foo', 'bar');
+ $this->resolver->addNormalizer('foo', function (Options $options, $value) {
+ return '1st-normalized-'.$value;
+ }, true);
+
+ $this->assertEquals(['foo' => '1st-normalized-bar'], $this->resolver->resolve());
+ }
+
public function testAddNormalizerFailsIfUnknownOption()
{
$this->expectException('Symfony\Component\OptionsResolver\Exception\UndefinedOptionsException');
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