diff --git a/composer.json b/composer.json
index 7f6187d..5b3800c 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
 
     "extra" : {
         "branch-alias" : {
-            "dev-master" : "1.0.x-dev"
+            "dev-master" : "0.4.x-dev"
         }
     }
 }
diff --git a/src/Normalizer/ChainNormalizer.php b/src/Normalizer/ChainNormalizer.php
index e25d9cc..0e26d34 100644
--- a/src/Normalizer/ChainNormalizer.php
+++ b/src/Normalizer/ChainNormalizer.php
@@ -32,6 +32,10 @@ public function add(Normalizer $normalizer)
      */
     public function normalize($value)
     {
+        if (!is_scalar($value)) {
+            return $value;
+        }
+
         foreach ($this->normalizers as $normalizer) {
             $value = $normalizer->normalize($value);
         }