diff --git a/Event/EventManager.php b/Event/EventManager.php
index 84ff8cc88..b4f24b8be 100644
--- a/Event/EventManager.php
+++ b/Event/EventManager.php
@@ -68,13 +68,14 @@ final class EventManager implements \Countable
     {
         $this->dispatcher = $dispatcher ?? new class() implements DispatcherInterface {
             /**
-             * Dispatches a function
-             *
-             * @param \Closure $func    Function
-             * @param mixed    ...$data Date passed to function
+             * {@inheritdoc}
              */
-            public function dispatch(\Closure $func, ...$data) : array
+            public function dispatch($func, ...$data) : array
             {
+                if (!($func instanceof \Closure)) {
+                    return [];
+                }
+
                 $func(...$data);
 
                 return [];
diff --git a/Localization/Localization.php b/Localization/Localization.php
index 08d9ab5ed..615827822 100644
--- a/Localization/Localization.php
+++ b/Localization/Localization.php
@@ -170,6 +170,10 @@ class Localization
 
         $files = \glob(__DIR__ . '/../Localization/Defaults/Definitions/' . $langCode . '_' . $countryCode);
 
+        if ($files === false) {
+            $files = [];
+        }
+
         foreach ($files as $file) {
             $fileContent = \file_get_contents($file);
 
diff --git a/Math/Statistic/MeasureOfDispersion.php b/Math/Statistic/MeasureOfDispersion.php
index 8ec8dd1a7..13caf60eb 100644
--- a/Math/Statistic/MeasureOfDispersion.php
+++ b/Math/Statistic/MeasureOfDispersion.php
@@ -236,13 +236,12 @@ final class MeasureOfDispersion
             --$count;
         }
 
+        /** @var int $count */
         $count /= 2;
 
         \sort($x);
 
-        /** @var int $count */
         $Q1 = Average::median(\array_slice($x, 0, $count));
-        /** @var int $count */
         $Q3 = Average::median(\array_slice($x, -$count, $count));
 
         return $Q3 - $Q1;
diff --git a/Message/HeaderAbstract.php b/Message/HeaderAbstract.php
index 4ba9c92c2..99ab68f1a 100644
--- a/Message/HeaderAbstract.php
+++ b/Message/HeaderAbstract.php
@@ -37,10 +37,10 @@ abstract class HeaderAbstract
     /**
      * Localization.
      *
-     * @var   null|Localization
+     * @var   Localization
      * @since 1.0.0
      */
-    protected ?Localization $l11n = null;
+    protected Localization $l11n;
 
     /**
      * Account.