diff --git a/src/Symfony/Component/VarExporter/Internal/Exporter.php b/src/Symfony/Component/VarExporter/Internal/Exporter.php
index b15e06af969cc..d3c21e83ada56 100644
--- a/src/Symfony/Component/VarExporter/Internal/Exporter.php
+++ b/src/Symfony/Component/VarExporter/Internal/Exporter.php
@@ -283,6 +283,15 @@ private static function exportRegistry(Registry $value, string $indent, string $
                 $serializables[$k] = $class;
                 continue;
             }
+            if (!Registry::$instantiableWithoutConstructor[$class]) {
+                if (is_subclass_of($class, 'Throwable')) {
+                    $eol = is_subclass_of($class, 'Error') ? "\0Error\0" : "\0Exception\0";
+                    $serializables[$k] = 'O:'.\strlen($class).':"'.$class.'":1:{s:'.(5 + \strlen($eol)).':"'.$eol.'trace";a:0:{}}';
+                } else {
+                    $serializables[$k] = 'O:'.\strlen($class).':"'.$class.'":0:{}';
+                }
+                continue;
+            }
             $code .= $subIndent.(1 !== $k - $j ? $k.' => ' : '');
             $j = $k;
             $eol = ",\n";
@@ -299,21 +308,21 @@ private static function exportRegistry(Registry $value, string $indent, string $
             } else {
                 $seen[$class] = true;
                 if (Registry::$cloneable[$class]) {
-                    $code .= 'clone ('.($prototypesAccess++ ? '$p' : '($p =& '.$r.'::$prototypes)').$c.' ?? '.$r.'::p';
+                    $code .= 'clone ('.($prototypesAccess++ ? '$p' : '($p = &'.$r.'::$prototypes)').$c.' ?? '.$r.'::p';
                 } else {
-                    $code .= '('.($factoriesAccess++ ? '$f' : '($f =& '.$r.'::$factories)').$c.' ?? '.$r.'::f';
+                    $code .= '('.($factoriesAccess++ ? '$f' : '($f = &'.$r.'::$factories)').$c.' ?? '.$r.'::f';
                     $eol = '()'.$eol;
                 }
-                $code .= '('.substr($c, 1, -1).', '.self::export(Registry::$instantiableWithoutConstructor[$class]).'))';
+                $code .= '('.substr($c, 1, -1).'))';
             }
             $code .= $eol;
         }
 
         if (1 === $prototypesAccess) {
-            $code = str_replace('($p =& '.$r.'::$prototypes)', $r.'::$prototypes', $code);
+            $code = str_replace('($p = &'.$r.'::$prototypes)', $r.'::$prototypes', $code);
         }
         if (1 === $factoriesAccess) {
-            $code = str_replace('($f =& '.$r.'::$factories)', $r.'::$factories', $code);
+            $code = str_replace('($f = &'.$r.'::$factories)', $r.'::$factories', $code);
         }
         if ('' !== $code) {
             $code = "\n".$code.$indent;
diff --git a/src/Symfony/Component/VarExporter/Internal/Registry.php b/src/Symfony/Component/VarExporter/Internal/Registry.php
index bf943d5e2b29f..f08d60eb5bd6f 100644
--- a/src/Symfony/Component/VarExporter/Internal/Registry.php
+++ b/src/Symfony/Component/VarExporter/Internal/Registry.php
@@ -46,43 +46,50 @@ public static function unserialize($objects, $serializables)
         return $objects;
     }
 
-    public static function p($class, $instantiableWithoutConstructor)
+    public static function p($class)
     {
-        self::getClassReflector($class, $instantiableWithoutConstructor, true);
+        self::getClassReflector($class, true, true);
 
         return self::$prototypes[$class];
     }
 
-    public static function f($class, $instantiableWithoutConstructor)
+    public static function f($class)
     {
-        $reflector = self::$reflectors[$class] ?? self::getClassReflector($class, $instantiableWithoutConstructor, false);
+        $reflector = self::$reflectors[$class] ?? self::getClassReflector($class, true, false);
 
-        return self::$factories[$class] = \Closure::fromCallable(array($reflector, $instantiableWithoutConstructor ? 'newInstanceWithoutConstructor' : 'newInstance'));
+        return self::$factories[$class] = \Closure::fromCallable(array($reflector, 'newInstanceWithoutConstructor'));
     }
 
-    public static function getClassReflector($class, $instantiableWithoutConstructor = null, $cloneable = null)
+    public static function getClassReflector($class, $instantiableWithoutConstructor = false, $cloneable = null)
     {
         $reflector = new \ReflectionClass($class);
 
-        if (self::$instantiableWithoutConstructor[$class] = $instantiableWithoutConstructor ?? (!$reflector->isFinal() || !$reflector->isInternal())) {
+        if (self::$instantiableWithoutConstructor[$class] = $instantiableWithoutConstructor || !$reflector->isFinal()) {
             $proto = $reflector->newInstanceWithoutConstructor();
         } else {
-            try {
-                $proto = $reflector->newInstance();
-            } catch (\Throwable $e) {
-                throw new \Exception(sprintf("Serialization of '%s' is not allowed", $class), 0, $e);
+            self::$instantiableWithoutConstructor[$class] = true;
+            $r = $reflector;
+            do {
+                if ($r->isInternal()) {
+                    self::$instantiableWithoutConstructor[$class] = false;
+                    if (false === $proto = @unserialize('O:'.\strlen($class).':"'.$class.'":0:{}')) {
+                        throw new \Exception(sprintf("Serialization of '%s' is not allowed", $class));
+                    }
+                    break;
+                }
+            } while ($r = $r->getParentClass());
+
+            if (!$r) {
+                $proto = $reflector->newInstanceWithoutConstructor();
             }
         }
 
-        if (null !== self::$cloneable[$class] = $cloneable) {
-            // no-op
-        } elseif ($proto instanceof \Reflector || $proto instanceof \ReflectionGenerator || $proto instanceof \ReflectionType || $proto instanceof \IteratorIterator || $proto instanceof \RecursiveIteratorIterator) {
-            if (!$proto instanceof \Serializable && !\method_exists($proto, '__wakeup')) {
+        if (null === self::$cloneable[$class] = $cloneable) {
+            if (($proto instanceof \Reflector || $proto instanceof \ReflectionGenerator || $proto instanceof \ReflectionType || $proto instanceof \IteratorIterator || $proto instanceof \RecursiveIteratorIterator) && (!$proto instanceof \Serializable && !\method_exists($proto, '__wakeup'))) {
                 throw new \Exception(sprintf("Serialization of '%s' is not allowed", $class));
             }
-            self::$cloneable[$class] = false;
-        } else {
-            self::$cloneable[$class] = !$reflector->hasMethod('__clone');
+
+            self::$cloneable[$class] = $reflector->isCloneable() && !$reflector->hasMethod('__clone');
         }
 
         self::$prototypes[$class] = $proto;
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/array-iterator.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/array-iterator.php
index c53b14c86790d..9c719032869e0 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/array-iterator.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/array-iterator.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\ArrayIterator::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\ArrayIterator::class, true)),
+        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\ArrayIterator::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\ArrayIterator::class)),
     ],
     null,
     [
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object-custom.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object-custom.php
index 6e0f71a5aa5db..b3a56000078fc 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object-custom.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object-custom.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\Symfony\Component\VarExporter\Tests\MyArrayObject::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyArrayObject::class, true)),
+        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\Symfony\Component\VarExporter\Tests\MyArrayObject::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyArrayObject::class)),
     ],
     null,
     [
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object.php
index 33f8388e1bc4f..50b66d744590c 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/array-object.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (($p =& \Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\ArrayObject::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\ArrayObject::class, true)),
+        clone (($p = &\Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\ArrayObject::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\ArrayObject::class)),
         clone $p[\ArrayObject::class],
     ],
     null,
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/clone.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/clone.php
index da77dab65e2df..e9702ac4c3b8e 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/clone.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/clone.php
@@ -2,8 +2,8 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        (($f =& \Symfony\Component\VarExporter\Internal\Registry::$factories)[\Symfony\Component\VarExporter\Tests\MyCloneable::class] ?? \Symfony\Component\VarExporter\Internal\Registry::f(\Symfony\Component\VarExporter\Tests\MyCloneable::class, true))(),
-        ($f[\Symfony\Component\VarExporter\Tests\MyNotCloneable::class] ?? \Symfony\Component\VarExporter\Internal\Registry::f(\Symfony\Component\VarExporter\Tests\MyNotCloneable::class, true))(),
+        (($f = &\Symfony\Component\VarExporter\Internal\Registry::$factories)[\Symfony\Component\VarExporter\Tests\MyCloneable::class] ?? \Symfony\Component\VarExporter\Internal\Registry::f(\Symfony\Component\VarExporter\Tests\MyCloneable::class))(),
+        ($f[\Symfony\Component\VarExporter\Tests\MyNotCloneable::class] ?? \Symfony\Component\VarExporter\Internal\Registry::f(\Symfony\Component\VarExporter\Tests\MyNotCloneable::class))(),
     ],
     null,
     [],
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/datetime.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/datetime.php
index 8287e154dd486..b1dba9ec5be2f 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/datetime.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/datetime.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\DateTime::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\DateTime::class, true)),
+        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\DateTime::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\DateTime::class)),
     ],
     null,
     [
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/error.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/error.php
index e36b547bd8512..7ad1574177677 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/error.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/error.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        (\Symfony\Component\VarExporter\Internal\Registry::$factories[\Error::class] ?? \Symfony\Component\VarExporter\Internal\Registry::f(\Error::class, true))(),
+        (\Symfony\Component\VarExporter\Internal\Registry::$factories[\Error::class] ?? \Symfony\Component\VarExporter\Internal\Registry::f(\Error::class))(),
     ],
     null,
     [
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/final-error.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/final-error.php
new file mode 100644
index 0000000000000..03e9e50f02bb2
--- /dev/null
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/final-error.php
@@ -0,0 +1,22 @@
+<?php
+
+return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
+    $o = \Symfony\Component\VarExporter\Internal\Registry::unserialize([], [
+        'O:46:"Symfony\\Component\\VarExporter\\Tests\\FinalError":1:{s:12:"'."\0".'Error'."\0".'trace";a:0:{}}',
+    ]),
+    null,
+    [
+        \TypeError::class => [
+            'file' => [
+                \dirname(__DIR__).\DIRECTORY_SEPARATOR.'VarExporterTest.php',
+            ],
+            'line' => [
+                123,
+            ],
+        ],
+    ],
+    $o[0],
+    [
+        1 => 0,
+    ]
+);
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/hard-references.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/hard-references.php
index a148241e45db0..15d97f1ec7b3f 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/hard-references.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/hard-references.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\stdClass::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\stdClass::class, true)),
+        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\stdClass::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\stdClass::class)),
     ],
     [
         $r = [],
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/private.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/private.php
index 234c01e271208..9c38d69693a91 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/private.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/private.php
@@ -2,8 +2,8 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (($p =& \Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\Symfony\Component\VarExporter\Tests\MyPrivateValue::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyPrivateValue::class, true)),
-        clone ($p[\Symfony\Component\VarExporter\Tests\MyPrivateChildValue::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyPrivateChildValue::class, true)),
+        clone (($p = &\Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\Symfony\Component\VarExporter\Tests\MyPrivateValue::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyPrivateValue::class)),
+        clone ($p[\Symfony\Component\VarExporter\Tests\MyPrivateChildValue::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyPrivateChildValue::class)),
     ],
     null,
     [
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/spl-object-storage.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/spl-object-storage.php
index 93f7320aa0dd6..24585973a3198 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/spl-object-storage.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/spl-object-storage.php
@@ -2,8 +2,8 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (($p =& \Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\SplObjectStorage::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\SplObjectStorage::class, true)),
-        clone ($p[\stdClass::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\stdClass::class, true)),
+        clone (($p = &\Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\SplObjectStorage::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\SplObjectStorage::class)),
+        clone ($p[\stdClass::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\stdClass::class)),
     ],
     null,
     [
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/var-on-sleep.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/var-on-sleep.php
index b013ef14efc97..46e0bc05cbece 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/var-on-sleep.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/var-on-sleep.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\Symfony\Component\VarExporter\Tests\GoodNight::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\GoodNight::class, true)),
+        clone (\Symfony\Component\VarExporter\Internal\Registry::$prototypes[\Symfony\Component\VarExporter\Tests\GoodNight::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\GoodNight::class)),
     ],
     null,
     [
diff --git a/src/Symfony/Component/VarExporter/Tests/Fixtures/wakeup.php b/src/Symfony/Component/VarExporter/Tests/Fixtures/wakeup.php
index 73be0345b0b5c..d5dc7a312fce1 100644
--- a/src/Symfony/Component/VarExporter/Tests/Fixtures/wakeup.php
+++ b/src/Symfony/Component/VarExporter/Tests/Fixtures/wakeup.php
@@ -2,7 +2,7 @@
 
 return \Symfony\Component\VarExporter\Internal\Hydrator::hydrate(
     $o = [
-        clone (($p =& \Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\Symfony\Component\VarExporter\Tests\MyWakeup::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyWakeup::class, true)),
+        clone (($p = &\Symfony\Component\VarExporter\Internal\Registry::$prototypes)[\Symfony\Component\VarExporter\Tests\MyWakeup::class] ?? \Symfony\Component\VarExporter\Internal\Registry::p(\Symfony\Component\VarExporter\Tests\MyWakeup::class)),
         clone $p[\Symfony\Component\VarExporter\Tests\MyWakeup::class],
     ],
     null,
diff --git a/src/Symfony/Component/VarExporter/Tests/VarExporterTest.php b/src/Symfony/Component/VarExporter/Tests/VarExporterTest.php
index b8f4db09d6a65..eb00738364105 100644
--- a/src/Symfony/Component/VarExporter/Tests/VarExporterTest.php
+++ b/src/Symfony/Component/VarExporter/Tests/VarExporterTest.php
@@ -158,17 +158,23 @@ public function provideMarshall()
 
         $value = new \Error();
 
-        $r = new \ReflectionProperty('Error', 'trace');
-        $r->setAccessible(true);
-        $r->setValue($value, array('file' => __FILE__, 'line' => 123));
+        $rt = new \ReflectionProperty('Error', 'trace');
+        $rt->setAccessible(true);
+        $rt->setValue($value, array('file' => __FILE__, 'line' => 123));
 
-        $r = new \ReflectionProperty('Error', 'line');
-        $r->setAccessible(true);
-        $r->setValue($value, 234);
+        $rl = new \ReflectionProperty('Error', 'line');
+        $rl->setAccessible(true);
+        $rl->setValue($value, 234);
 
         yield array('error', $value);
 
         yield array('var-on-sleep', new GoodNight());
+
+        $value = new FinalError(false);
+        $rt->setValue($value, array());
+        $rl->setValue($value, 123);
+
+        yield array('final-error', $value);
     }
 }
 
@@ -262,3 +268,13 @@ public function __sleep()
         return array('good');
     }
 }
+
+final class FinalError extends \Error
+{
+    public function __construct(bool $throw = true)
+    {
+        if ($throw) {
+            throw new \BadMethodCallException('Should not be called.');
+        }
+    }
+}