diff --git a/src/Symfony/Component/Serializer/NameConverter/MetadataAwareNameConverter.php b/src/Symfony/Component/Serializer/NameConverter/MetadataAwareNameConverter.php
index bbf70eaac373..a3ffaa3df5e1 100644
--- a/src/Symfony/Component/Serializer/NameConverter/MetadataAwareNameConverter.php
+++ b/src/Symfony/Component/Serializer/NameConverter/MetadataAwareNameConverter.php
@@ -47,7 +47,7 @@ public function normalize($propertyName, string $class = null, string $format =
return $this->normalizeFallback($propertyName, $class, $format, $context);
}
- if (!isset(self::$normalizeCache[$class][$propertyName])) {
+ if (!\array_key_exists($class, self::$normalizeCache) || !\array_key_exists($propertyName, self::$normalizeCache[$class])) {
self::$normalizeCache[$class][$propertyName] = $this->getCacheValueForNormalization($propertyName, $class);
}
@@ -64,7 +64,7 @@ public function denormalize($propertyName, string $class = null, string $format
}
$cacheKey = $this->getCacheKey($class, $context);
- if (!isset(self::$denormalizeCache[$cacheKey][$propertyName])) {
+ if (!\array_key_exists($cacheKey, self::$denormalizeCache) || !\array_key_exists($propertyName, self::$denormalizeCache[$cacheKey])) {
self::$denormalizeCache[$cacheKey][$propertyName] = $this->getCacheValueForDenormalization($propertyName, $class, $context);
}
@@ -78,7 +78,7 @@ private function getCacheValueForNormalization(string $propertyName, string $cla
}
$attributesMetadata = $this->metadataFactory->getMetadataFor($class)->getAttributesMetadata();
- if (!isset($attributesMetadata[$propertyName])) {
+ if (!\array_key_exists($propertyName, $attributesMetadata)) {
return null;
}
@@ -93,7 +93,7 @@ private function normalizeFallback(string $propertyName, string $class = null, s
private function getCacheValueForDenormalization(string $propertyName, string $class, array $context): ?string
{
$cacheKey = $this->getCacheKey($class, $context);
- if (!isset(self::$attributesMetadataCache[$cacheKey])) {
+ if (!\array_key_exists($cacheKey, self::$attributesMetadataCache)) {
self::$attributesMetadataCache[$cacheKey] = $this->getCacheValueForAttributesMetadata($class, $context);
}
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