diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
index a3e6c8a5dc05..dca547c9f009 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
@@ -231,7 +231,18 @@ private function &readPropertiesUntil(&$objectOrArray, PropertyPathInterface $pr
             // Create missing nested arrays on demand
             if ($isIndex && $isArrayAccess && !isset($objectOrArray[$property])) {
                 if (!$ignoreInvalidIndices) {
-                    throw new NoSuchIndexException(sprintf('Cannot read property "%s". Available properties are "%s"', $property, print_r(array_keys($objectOrArray), true)));
+                    $message = sprintf('Cannot read property "%s".', $property);
+                    $keys = 'not available';
+                    if (is_array($objectOrArray)) {
+                        $keys = '"'.print_r(array_keys($objectOrArray), true).'"';
+                    } elseif ($objectOrArray instanceof \Traversable) {
+                        $list = array();
+                        foreach ($objectOrArray as $key => &$value) {
+                            $list[] = $key;
+                        }
+                        $keys = '"'.print_r($list, true).'"';
+                    }
+                    throw new NoSuchIndexException(sprintf('Cannot read property "%s". Available properties are %s', $property, $keys));
                 }
 
                 $objectOrArray[$property] = $i + 1 < $propertyPath->getLength() ? array() : null;
diff --git a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCustomArrayObjectTest.php b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCustomArrayObjectTest.php
index 7340df720fbf..35fccbfa31ba 100644
--- a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCustomArrayObjectTest.php
+++ b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCustomArrayObjectTest.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\PropertyAccess\Tests;
 
+use Symfony\Component\PropertyAccess\PropertyAccessor;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\CustomArrayObject;
 
 class PropertyAccessorCustomArrayObjectTest extends PropertyAccessorCollectionTest
@@ -19,4 +20,15 @@ protected function getCollection(array $array)
     {
         return new CustomArrayObject($array);
     }
+
+    /**
+     * @expectedException \Symfony\Component\PropertyAccess\Exception\NoSuchIndexException
+     */
+    public function testGetNoSuchIndex()
+    {
+        $arrayObject = new CustomArrayObject(array('foo', 'bar'));
+        $propertyAccessor = new PropertyAccessor(false, true);
+
+        $propertyAccessor->getValue($arrayObject, '[2]');
+    }
 }