diff --git a/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php b/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php
index b8a9048fce..f6573b34fd 100644
--- a/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php
@@ -25,34 +25,35 @@ class DoctrineCaster
 {
     public static function castCommonProxy(CommonProxy $proxy, array $a, Stub $stub, $isNested)
     {
-        unset(
-            $a['__cloner__'],
-            $a['__initializer__']
-        );
-        $stub->cut += 2;
+        foreach (array('__cloner__', '__initializer__') as $k) {
+            if (array_key_exists($k, $a)) {
+                unset($a[$k]);
+                ++$stub->cut;
+            }
+        }
 
         return $a;
     }
 
     public static function castOrmProxy(OrmProxy $proxy, array $a, Stub $stub, $isNested)
     {
-        $prefix = "\0Doctrine\\ORM\\Proxy\\Proxy\0";
-        unset(
-            $a[$prefix.'_entityPersister'],
-            $a[$prefix.'_identifier']
-        );
-        $stub->cut += 2;
+        foreach (array('_entityPersister', '_identifier') as $k) {
+            if (array_key_exists($k = "\0Doctrine\\ORM\\Proxy\\Proxy\0".$k, $a)) {
+                unset($a[$k]);
+                ++$stub->cut;
+            }
+        }
 
         return $a;
     }
 
     public static function castPersistentCollection(PersistentCollection $coll, array $a, Stub $stub, $isNested)
     {
-        $prefix = "\0Doctrine\\ORM\\PersistentCollection\0";
-
-        $a[$prefix.'snapshot'] = new CutStub($a[$prefix.'snapshot']);
-        $a[$prefix.'association'] = new CutStub($a[$prefix.'association']);
-        $a[$prefix.'typeClass'] = new CutStub($a[$prefix.'typeClass']);
+        foreach (array('snapshot', 'association', 'typeClass') as $k) {
+            if (array_key_exists($k = "\0Doctrine\\ORM\\PersistentCollection\0".$k, $a)) {
+                $a[$k] = new CutStub($a[$k]);
+            }
+        }
 
         return $a;
     }
diff --git a/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php b/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
index 53a58260f1..476f1dbf5d 100644
--- a/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
@@ -43,8 +43,12 @@ class ExceptionCaster
     public static function castException(\Exception $e, array $a, Stub $stub, $isNested, $filter = 0)
     {
         $xPrefix = PHP_VERSION_ID >= 70000 ? "\0BaseException\0" : "\0Exception\0";
-        $trace = $a[$xPrefix.'trace'];
-        unset($a[$xPrefix.'trace']); // Ensures the trace is always last
+        if (isset($a[$xPrefix.'trace'])) {
+            $trace = $a[$xPrefix.'trace'];
+            unset($a[$xPrefix.'trace']); // Ensures the trace is always last
+        } else {
+            $trace = array();
+        }
 
         if (!($filter & Caster::EXCLUDE_VERBOSE)) {
             static::filterTrace($trace, static::$traceArgs);
@@ -74,9 +78,9 @@ class ExceptionCaster
     {
         $prefix = Caster::PREFIX_PROTECTED;
         $xPrefix = PHP_VERSION_ID >= 70000 ? "\0BaseException\0" : "\0Exception\0";
-        $b = (array) $a[$xPrefix.'previous'];
 
-        if (isset($a[$xPrefix.'trace'][0])) {
+        if (isset($a[$xPrefix.'previous'], $a[$xPrefix.'trace'][0])) {
+            $b = (array) $a[$xPrefix.'previous'];
             $b[$xPrefix.'trace'][0] += array(
                 'file' => $b[$prefix.'file'],
                 'line' => $b[$prefix.'line'],
diff --git a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
index e4f7a7c053..ff5f313419 100644
--- a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
+++ b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
@@ -214,7 +214,7 @@ abstract class AbstractCloner implements ClonerInterface
             $classInfo = array(
                 $class,
                 new \ReflectionClass($class),
-                array_reverse(array('*' => '*', $class => $class) + class_parents($class) + class_implements($class)),
+                array_reverse(array($class => $class) + class_parents($class) + class_implements($class) + array('*' => '*')),
             );
 
             $this->classInfo[$class] = $classInfo;
diff --git a/src/Symfony/Component/VarDumper/Tests/VarClonerTest.php b/src/Symfony/Component/VarDumper/Tests/VarClonerTest.php
index 620acdcccd..733bf35586 100644
--- a/src/Symfony/Component/VarDumper/Tests/VarClonerTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/VarClonerTest.php
@@ -139,12 +139,12 @@ EOTXT;
     {
         $cloner = new VarCloner(array(
             '*' => function ($obj, $array) {
-                $array['foo'] = 123;
-
-                return $array;
+                return array('foo' => 123);
             },
             __CLASS__ => function ($obj, $array) {
-                return array();
+                ++$array['foo'];
+
+                return $array;
             },
         ));
         $clone = $cloner->cloneVar($this);
@@ -171,7 +171,7 @@ Symfony\Component\VarDumper\Cloner\Data Object
 
             [1] => Array
                 (
-                    [foo] => 123
+                    [foo] => 124
                 )
 
         )