diff --git a/Math/Number/Prime.php b/Math/Number/Prime.php
index 1345c827e..44b0c6389 100644
--- a/Math/Number/Prime.php
+++ b/Math/Number/Prime.php
@@ -105,13 +105,17 @@ final class Prime
             }
 
             for ($j = 1; $j < $s; ++$j) {
+                if ($x === null) {
+                    return false;
+                }
+
                 $mul = \bcmul($x, $x);
                 /*if ($mul === null) {
                     return false;
                 }*/
 
                 $x = \bcmod($mul, (string) $n);
-                if ($x == 1) {
+                if ($x == 1 || $x === null) {
                     return false;
                 }
 
diff --git a/Message/Console/ConsoleHeader.php b/Message/Console/ConsoleHeader.php
index 8272239ef..ae036e0f5 100644
--- a/Message/Console/ConsoleHeader.php
+++ b/Message/Console/ConsoleHeader.php
@@ -44,16 +44,6 @@ final class ConsoleHeader extends HeaderAbstract
      */
     private array $header = [];
 
-    /**
-     * Constructor.
-     *
-     * @since 1.0.0
-     */
-    public function __construct()
-    {
-        parent::__construct();
-    }
-
     /**
      * Set header.
      *
diff --git a/tests/Message/Mail/MailHandlerTest.php b/tests/Message/Mail/MailHandlerTest.php
index 4302c5d5e..a65f293c6 100644
--- a/tests/Message/Mail/MailHandlerTest.php
+++ b/tests/Message/Mail/MailHandlerTest.php
@@ -241,6 +241,10 @@ class MailHandlerTest extends \PHPUnit\Framework\TestCase
             self::markTestSkipped();
         }
 
+        var_dump($sendmailPath);
+        var_dump($this->handler->mailerTool);
+        var_dump(OperatingSystem::getSystem());
+
         $mail = new Email();
         $mail->setFrom('test1@orange-management.email', 'Dennis Eichhorn');
         $mail->addTo('test@orange-management.email', 'Dennis Eichhorn');