diff --git a/src/Bridge/Symfony/Bundle/SonataFormBundle.php b/src/Bridge/Symfony/Bundle/SonataFormBundle.php
index d1ceceae..80d515b4 100644
--- a/src/Bridge/Symfony/Bundle/SonataFormBundle.php
+++ b/src/Bridge/Symfony/Bundle/SonataFormBundle.php
@@ -21,18 +21,12 @@
  */
 final class SonataFormBundle extends Bundle
 {
-    /**
-     * @return string
-     */
-    public function getPath()
+    public function getPath(): string
     {
         return __DIR__.'/..';
     }
 
-    /**
-     * @return string
-     */
-    protected function getContainerExtensionClass()
+    protected function getContainerExtensionClass(): string
     {
         return SonataFormExtension::class;
     }
diff --git a/src/Bridge/Symfony/Resources/config/form_types.php b/src/Bridge/Symfony/Resources/config/form_types.php
index 46f55204..0626e1e8 100644
--- a/src/Bridge/Symfony/Resources/config/form_types.php
+++ b/src/Bridge/Symfony/Resources/config/form_types.php
@@ -37,7 +37,7 @@
             ];
         }
 
-        return [$message];
+        return [$message, '', ''];
     };
 
     // Use "service" function for creating references to services when dropping support for Symfony 4.4
diff --git a/src/Type/BaseDoctrineORMSerializationType.php b/src/Type/BaseDoctrineORMSerializationType.php
index e5567676..d84f2533 100644
--- a/src/Type/BaseDoctrineORMSerializationType.php
+++ b/src/Type/BaseDoctrineORMSerializationType.php
@@ -125,7 +125,7 @@ public function buildForm(FormBuilderInterface $builder, array $options): void
                 continue;
             }
 
-            if (!\in_array($this->group, $propertyMetadata->groups, true)) {
+            if (!isset($propertyMetadata->groups) || !\in_array($this->group, $propertyMetadata->groups, true)) {
                 continue;
             }
 
diff --git a/src/Type/BasePickerType.php b/src/Type/BasePickerType.php
index 31a99400..c997f62b 100644
--- a/src/Type/BasePickerType.php
+++ b/src/Type/BasePickerType.php
@@ -152,6 +152,9 @@ public function getLocale(): string
         return $this->locale;
     }
 
+    /**
+     * @param string $locale
+     */
     public function setLocale($locale): void
     {
         $this->locale = $locale;
diff --git a/src/Validator/InlineValidator.php b/src/Validator/InlineValidator.php
index b5106764..d9b6c6ab 100755
--- a/src/Validator/InlineValidator.php
+++ b/src/Validator/InlineValidator.php
@@ -43,6 +43,9 @@ public function __construct(
         $this->constraintValidatorFactory = $constraintValidatorFactory;
     }
 
+    /**
+     * @param mixed $value
+     */
     public function validate($value, Constraint $constraint): void
     {
         if (!$constraint instanceof InlineConstraint) {