diff --git a/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php b/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
index fc30dd57e3f0e..9c7b548571da6 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
@@ -186,13 +186,14 @@ public function buildForm(FormBuilderInterface $builder, array $options)
         }
 
         if ($options['multiple']) {
-            $builder->addEventListener(FormEvents::POST_SUBMIT, function (FormEvent $event) use (&$unknownValues) {
+            $messageTemplate = $options['invalid_message'] ?? 'The value {{ value }} is not valid.';
+
+            $builder->addEventListener(FormEvents::POST_SUBMIT, function (FormEvent $event) use (&$unknownValues, $messageTemplate) {
                 // Throw exception if unknown values were submitted
                 if (\count($unknownValues) > 0) {
                     $form = $event->getForm();
 
-                    $clientDataAsString = is_scalar($form->getViewData()) ? (string) $form->getViewData() : \gettype($form->getViewData());
-                    $messageTemplate = 'The value {{ value }} is not valid.';
+                    $clientDataAsString = is_scalar($form->getViewData()) ? (string) $form->getViewData() : (\is_array($form->getViewData()) ? implode('", "', array_keys($unknownValues)) : \gettype($form->getViewData()));
 
                     if (null !== $this->translator) {
                         $message = $this->translator->trans($messageTemplate, ['{{ value }}' => $clientDataAsString], 'validators');
@@ -200,7 +201,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                         $message = strtr($messageTemplate, ['{{ value }}' => $clientDataAsString]);
                     }
 
-                    $form->addError(new FormError($message, $messageTemplate, ['{{ value }}' => $clientDataAsString], null, new TransformationFailedException(sprintf('The choices "%s" do not exist in the choice list.', implode('", "', array_keys($unknownValues))))));
+                    $form->addError(new FormError($message, $messageTemplate, ['{{ value }}' => $clientDataAsString], null, new TransformationFailedException(sprintf('The choices "%s" do not exist in the choice list.', $clientDataAsString))));
                 }
             });
 
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php
index b09665084dd6e..53ad49af5f861 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php
@@ -1849,6 +1849,32 @@ public function testAdjustFullNameForMultipleNonExpanded()
         $this->assertSame('name[]', $view->vars['full_name']);
     }
 
+    public function testInvalidMessageAwarenessForMultiple()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'multiple' => true,
+            'expanded' => false,
+            'choices' => $this->choices,
+            'invalid_message' => 'You are not able to use value "{{ value }}"',
+        ]);
+
+        $form->submit(['My invalid choice']);
+        $this->assertEquals("ERROR: You are not able to use value \"My invalid choice\"\n", (string) $form->getErrors(true));
+    }
+
+    public function testInvalidMessageAwarenessForMultipleWithoutScalarOrArrayViewData()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'multiple' => true,
+            'expanded' => false,
+            'choices' => $this->choices,
+            'invalid_message' => 'You are not able to use value "{{ value }}"',
+        ]);
+
+        $form->submit(new \stdClass());
+        $this->assertEquals("ERROR: You are not able to use value \"stdClass\"\n", (string) $form->getErrors(true));
+    }
+
     // https://github.com/symfony/symfony/issues/3298
     public function testInitializeWithEmptyChoices()
     {