diff --git a/src/JMS/Serializer/GraphNavigator.php b/src/JMS/Serializer/GraphNavigator.php
index 87a4908f7..e8c27de04 100644
--- a/src/JMS/Serializer/GraphNavigator.php
+++ b/src/JMS/Serializer/GraphNavigator.php
@@ -26,6 +26,7 @@
 use JMS\Serializer\Handler\HandlerRegistryInterface;
 use JMS\Serializer\EventDispatcher\EventDispatcherInterface;
 use JMS\Serializer\Metadata\ClassMetadata;
+use JMS\Serializer\Util\String;
 use Metadata\MetadataFactoryInterface;
 use JMS\Serializer\Exception\InvalidArgumentException;
 
@@ -140,6 +141,9 @@ public function accept($data, array $type = null, Context $context)
                 // TODO: The rest of this method needs some refactoring.
                 if ($context instanceof SerializationContext) {
                     if (null !== $data) {
+	                    if(is_string($data)) {
+		                    $data = new String($data);
+	                    }
                         if ($context->isVisiting($data)) {
                             return null;
                         }
diff --git a/src/JMS/Serializer/Util/String.php b/src/JMS/Serializer/Util/String.php
new file mode 100644
index 000000000..68a18f76a
--- /dev/null
+++ b/src/JMS/Serializer/Util/String.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace JMS\Serializer\Util;
+
+/**
+ * Class String
+ * @package JMS\Serializer\Util
+ * @author  Bubelbub <bubelbub@gmail.com>
+ */
+class String
+{
+	/**
+	 * @var string
+	 */
+	private $content = null;
+
+	/**
+	 * @param string $content
+	 */
+	public function __construct($content)
+	{
+		$this->content = $content;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function __toString()
+	{
+		return $this->content;
+	}
+}