diff --git a/Classes/Controller/BookController.php b/Classes/Controller/BookController.php
index aea3a8b..7e06eef 100644
--- a/Classes/Controller/BookController.php
+++ b/Classes/Controller/BookController.php
@@ -82,7 +82,7 @@ public function listAction(int $currentPage = 1): void
         $demand = $this->createDemandObjectFromSettings('list', $this->settings);
         $demand->setActionAndClass(__METHOD__, __CLASS__);
 
-        $itemsPerPage = $this->settings['itemsPerPage'] ?? 20;
+        $itemsPerPage = (int)($this->settings['itemsPerPage'] ?? 20);
 
         $books = $this->bookRepository->findDemanded($demand);
         $arrayPaginator = new QueryResultPaginator(
diff --git a/ext_emconf.php b/ext_emconf.php
index 2595a0d..29b5307 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -5,7 +5,7 @@
     'description' => 'Shopping Cart(s) for TYPO3 - Book Extension',
     'category' => 'plugin',
     'shy' => false,
-    'version' => '4.1.0',
+    'version' => '4.1.1',
     'dependencies' => '',
     'conflicts' => '',
     'priority' => '',