diff --git a/Classes/Controller/TaskController.php b/Classes/Controller/TaskController.php
index 90fdd7b..f924a04 100644
--- a/Classes/Controller/TaskController.php
+++ b/Classes/Controller/TaskController.php
@@ -128,7 +128,7 @@ public function initializeAction(): void
      * @return ResponseInterface
      * @throws NoSuchArgumentException
      */
-    public function listAction(int $currentPage = 1, Demand $demand = null): ResponseInterface
+    public function listAction(int $currentPage = 1, ?Demand $demand = null): ResponseInterface
     {
         if(is_null($demand)){
             $tasks = $this->taskRepository->findAll();
diff --git a/Classes/Exception/StopRunException.php b/Classes/Exception/StopRunException.php
index 397737f..a3be7f4 100644
--- a/Classes/Exception/StopRunException.php
+++ b/Classes/Exception/StopRunException.php
@@ -12,7 +12,7 @@ class StopRunException extends Exception
      */
     protected $taskname;
 
-    public function __construct(string $taskname, $message = "", $code = 0, Throwable $previous = null)
+    public function __construct(string $taskname, $message = "", $code = 0, ?Throwable $previous = null)
     {
         $this->taskname = $taskname;
         parent::__construct($message, $code, $previous);
diff --git a/Classes/Widget/Provider/AbstractTaskqueueProvider.php b/Classes/Widget/Provider/AbstractTaskqueueProvider.php
index 05965ea..14ada41 100644
--- a/Classes/Widget/Provider/AbstractTaskqueueProvider.php
+++ b/Classes/Widget/Provider/AbstractTaskqueueProvider.php
@@ -50,14 +50,6 @@ public function prepareData(): void
     {
     }
 
-    /**
-     *
-     */
-    protected function prepareChartData(): void
-    {
-        $this->chartData = $this->getChartData();
-    }
-
     /**
      * @return array
      */
diff --git a/Documentation/Developer/Index.rst b/Documentation/Developer/Index.rst
index b15a6c1..097748d 100644
--- a/Documentation/Developer/Index.rst
+++ b/Documentation/Developer/Index.rst
@@ -242,7 +242,7 @@ StopRunException:
         */
        protected $taskname;
 
-       public function __construct($message = "", $code = 0, Throwable $previous = null, string $taskname)
+       public function __construct($message = "", $code = 0, ?Throwable $previous = null, string $taskname)
        {
            $this->taskname = $taskname;
            parent::__construct($message, $code, $previous);
diff --git a/ext_tables.php b/ext_tables.php
index 3c7ffd8..de3ff1e 100644
--- a/ext_tables.php
+++ b/ext_tables.php
@@ -2,27 +2,3 @@
 if (!defined('TYPO3')) {
     die('Access denied.');
 }
-(function () {
-    if (TYPO3 === 'BE') {
-
-        /**
-         * Registers a Backend Module
-         */
-        \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerModule(
-            'Taskqueue',
-            'tools',     // Make module a submodule of 'tools'
-            'taskqueue',    // Submodule key
-            '',                        // Position
-            [
-                \Undkonsorten\Taskqueue\Controller\TaskController::class => 'list, show, delete, run, deleteFinished, deleteFailed, reactivate, search, searchUid, searchResult',
-
-            ],
-            [
-                'access' => 'user,group',
-                'icon' => 'EXT:taskqueue/Resources/Public/Icons/Extension.svg',
-                'labels' => 'LLL:EXT:taskqueue/Resources/Private/Language/locallang_taskqueue.xlf',
-            ]
-        );
-    }
-
-})();