diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
index 554f36c585809..b431a17401945 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
@@ -279,7 +279,9 @@ protected function prepareForDenormalization($data)
* Instantiates an object using constructor parameters when needed.
*
* This method also allows to denormalize data into an existing object if
- * it is present in the context with the object_to_populate key.
+ * it is present in the context with the object_to_populate. This object
+ * is removed from the context before being returned to avoid side effects
+ * when recursively normalizing an object graph.
*
* @param array $data
* @param string $class
@@ -298,7 +300,10 @@ protected function instantiateObject(array &$data, $class, array &$context, \Ref
is_object($context['object_to_populate']) &&
$class === get_class($context['object_to_populate'])
) {
- return $context['object_to_populate'];
+ $object = $context['object_to_populate'];
+ unset($context['object_to_populate']);
+
+ return $object;
}
$constructor = $reflectionClass->getConstructor();
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