diff --git a/Build/php-cs-fixer.php b/Build/php-cs-fixer.php
index 6ee0307..16494b6 100644
--- a/Build/php-cs-fixer.php
+++ b/Build/php-cs-fixer.php
@@ -2,4 +2,10 @@
 
 $config = \TYPO3\CodingStandards\CsFixerConfig::create();
 $config->getFinder()->exclude(['var'])->in(__DIR__ . '/..');
+$config->addRules([
+    'nullable_type_declaration' => [
+        'syntax' => 'question_mark',
+    ],
+    'nullable_type_declaration_for_default_null_value' => true,
+]);
 return $config;
diff --git a/Classes/DataProcessing/ListItemsDataProcessor.php b/Classes/DataProcessing/ListItemsDataProcessor.php
index 5f0b557..c5be5b8 100644
--- a/Classes/DataProcessing/ListItemsDataProcessor.php
+++ b/Classes/DataProcessing/ListItemsDataProcessor.php
@@ -22,9 +22,7 @@
 #[Autoconfigure(public: true)]
 class ListItemsDataProcessor implements DataProcessorInterface
 {
-    public function __construct(protected ListService $listService, protected ContentDataProcessor $contentDataProcessor)
-    {
-    }
+    public function __construct(protected ListService $listService, protected ContentDataProcessor $contentDataProcessor) {}
 
     public function process(
         ContentObjectRenderer $cObj,
diff --git a/Classes/Listener/PageContentPreviewRendering.php b/Classes/Listener/PageContentPreviewRendering.php
index 6ba8321..dcd1f63 100644
--- a/Classes/Listener/PageContentPreviewRendering.php
+++ b/Classes/Listener/PageContentPreviewRendering.php
@@ -20,9 +20,7 @@
 #[AsEventListener(identifier: 'b13-listelements-page-content-preview-rendering')]
 class PageContentPreviewRendering
 {
-    public function __construct(protected ListService $listService)
-    {
-    }
+    public function __construct(protected ListService $listService) {}
 
     public function __invoke(PageContentPreviewRenderingEvent $event): void
     {
diff --git a/Classes/Service/ListService.php b/Classes/Service/ListService.php
index 6eae46f..ba34940 100644
--- a/Classes/Service/ListService.php
+++ b/Classes/Service/ListService.php
@@ -111,7 +111,7 @@ public function resolveItemsForFrontend(int $uid, string $table = 'tt_content',
             if (isset($results[$uid])) {
                 $item = $results[$uid];
                 $pageRepository->versionOL(self::TABLE, $item, true);
-                if ($item !== false) {
+                if (isset($item['uid'])) {
                     $items[] = $item;
                 }
             }
diff --git a/composer.json b/composer.json
index 0464fa6..814c135 100644
--- a/composer.json
+++ b/composer.json
@@ -23,8 +23,8 @@
     "typo3/testing-framework": "^9.1",
     "typo3/cms-frontend": "^13.4 || ^14.1",
     "typo3/cms-workspaces": "^13.4 || ^14.1",
-    "phpstan/phpstan": "^1.10",
-    "typo3/coding-standards": "^0.5.5",
+    "phpstan/phpstan": "^2.1",
+    "typo3/coding-standards": "^0.8",
     "b13/listelements-example": "*"
   },
   "autoload-dev": {