diff --git a/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php b/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php
index e26c2d5986..47901d3108 100644
--- a/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php
+++ b/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php
@@ -49,7 +49,7 @@ final class BodyRenderer implements BodyRendererInterface
 
         $previousRenderingKey = $messageContext[__CLASS__] ?? null;
         unset($messageContext[__CLASS__]);
-        $currentRenderingKey = md5(serialize([$messageContext, $message->getTextTemplate(), $message->getHtmlTemplate()]));
+        $currentRenderingKey = $this->getFingerPrint($message);
         if ($previousRenderingKey === $currentRenderingKey) {
             return;
         }
@@ -77,6 +77,23 @@ final class BodyRenderer implements BodyRendererInterface
         $message->context($message->getContext() + [__CLASS__ => $currentRenderingKey]);
     }
 
+    private function getFingerPrint(TemplatedEmail $message): string
+    {
+        $messageContext = $message->getContext();
+        unset($messageContext[__CLASS__]);
+
+        $payload = [$messageContext, $message->getTextTemplate(), $message->getHtmlTemplate()];
+        try {
+            $serialized = serialize($payload);
+        } catch (\Exception $e) {
+            // Serialization of 'Closure' is not allowed
+            // Happens when context contain a closure, in that case, we assume that context always change.
+            $serialized = random_bytes(8);
+        }
+
+        return md5($serialized);
+    }
+
     private function convertHtmlToText(string $html): string
     {
         if (null !== $this->converter) {
diff --git a/src/Symfony/Bridge/Twig/Tests/Mime/BodyRendererTest.php b/src/Symfony/Bridge/Twig/Tests/Mime/BodyRendererTest.php
index f13ab213c3..8ff343b684 100644
--- a/src/Symfony/Bridge/Twig/Tests/Mime/BodyRendererTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Mime/BodyRendererTest.php
@@ -100,6 +100,27 @@ HTML;
         $this->assertEquals('reset', $email->getTextBody());
     }
 
+    public function testRenderedOnceUnserializableContext()
+    {
+        $twig = new Environment(new ArrayLoader([
+            'text' => 'Text',
+        ]));
+        $renderer = new BodyRenderer($twig);
+        $email = (new TemplatedEmail())
+            ->to('fabien@symfony.com')
+            ->from('helene@symfony.com')
+        ;
+        $email->textTemplate('text');
+        $email->context([
+            'foo' => static function () {
+                return 'bar';
+            },
+        ]);
+
+        $renderer->render($email);
+        $this->assertEquals('Text', $email->getTextBody());
+    }
+
     private function prepareEmail(?string $text, ?string $html, array $context = []): TemplatedEmail
     {
         $twig = new Environment(new ArrayLoader([
diff --git a/src/Symfony/Component/Console/Command/Command.php b/src/Symfony/Component/Console/Command/Command.php
index 30f3796e6d..8e3afcf75f 100644
--- a/src/Symfony/Component/Console/Command/Command.php
+++ b/src/Symfony/Component/Console/Command/Command.php
@@ -429,9 +429,9 @@ class Command
     /**
      * Adds an option.
      *
-     * @param string|array|null             $shortcut The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
-     * @param int|null                      $mode     The option mode: One of the InputOption::VALUE_* constants
-     * @param string|string[]|int|bool|null $default  The default value (must be null for InputOption::VALUE_NONE)
+     * @param string|array|null         $shortcut The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
+     * @param int|null                  $mode     The option mode: One of the InputOption::VALUE_* constants
+     * @param string|string[]|bool|null $default  The default value (must be null for InputOption::VALUE_NONE)
      *
      * @throws InvalidArgumentException If option mode is invalid or incompatible
      *
diff --git a/src/Symfony/Component/Console/Input/InputOption.php b/src/Symfony/Component/Console/Input/InputOption.php
index 08be6eac94..a141f8106f 100644
--- a/src/Symfony/Component/Console/Input/InputOption.php
+++ b/src/Symfony/Component/Console/Input/InputOption.php
@@ -34,11 +34,11 @@ class InputOption
     private $description;
 
     /**
-     * @param string                        $name        The option name
-     * @param string|array|null             $shortcut    The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
-     * @param int|null                      $mode        The option mode: One of the VALUE_* constants
-     * @param string                        $description A description text
-     * @param string|string[]|int|bool|null $default     The default value (must be null for self::VALUE_NONE)
+     * @param string                    $name        The option name
+     * @param string|array|null         $shortcut    The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
+     * @param int|null                  $mode        The option mode: One of the VALUE_* constants
+     * @param string                    $description A description text
+     * @param string|string[]|bool|null $default     The default value (must be null for self::VALUE_NONE)
      *
      * @throws InvalidArgumentException If option mode is invalid or incompatible
      */
@@ -158,7 +158,7 @@ class InputOption
     /**
      * Sets the default value.
      *
-     * @param string|string[]|int|bool|null $default The default value
+     * @param string|string[]|bool|null $default The default value
      *
      * @throws LogicException When incorrect default value is given
      */
@@ -185,7 +185,7 @@ class InputOption
     /**
      * Returns the default value.
      *
-     * @return string|string[]|int|bool|null The default value
+     * @return string|string[]|bool|null The default value
      */
     public function getDefault()
     {
diff --git a/src/Symfony/Component/Validator/ConstraintViolation.php b/src/Symfony/Component/Validator/ConstraintViolation.php
index 2004745fe2..e9aa1bd9f4 100644
--- a/src/Symfony/Component/Validator/ConstraintViolation.php
+++ b/src/Symfony/Component/Validator/ConstraintViolation.php
@@ -100,7 +100,7 @@ class ConstraintViolation implements ConstraintViolationInterface
      */
     public function getMessageTemplate()
     {
-        return $this->messageTemplate;
+        return (string) $this->messageTemplate;
     }
 
     /**
diff --git a/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php b/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php
index a7734635aa..dbac96a8af 100644
--- a/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php
+++ b/src/Symfony/Component/Validator/Tests/ConstraintViolationTest.php
@@ -171,4 +171,19 @@ EOF;
             ))->getPropertyPath()
         );
     }
+
+    public function testRetrievedMessageTemplateIsAStringEvenIfNotSet()
+    {
+        self::assertSame(
+            '',
+            (new ConstraintViolation(
+                'irrelevant',
+                null,
+                [],
+                'irrelevant',
+                'irrelevant',
+                null
+            ))->getMessageTemplate()
+        );
+    }
 }