diff --git a/Classes/Controller/ModuleController.php b/Classes/Controller/ModuleController.php
index 49c32ea34..a3f394566 100644
--- a/Classes/Controller/ModuleController.php
+++ b/Classes/Controller/ModuleController.php
@@ -101,7 +101,7 @@ public function listAction(): ResponseInterface
             }
         }
 
-        $itemsPerPage = $this->settings['perPage'] ?? 10;
+        $itemsPerPage = (int)$this->settings['perPage'] ?? 10;
         $paginator = GeneralUtility::makeInstance(QueryResultPaginator::class, $mails, $currentPage, $itemsPerPage);
         $pagination = GeneralUtility::makeInstance(SlidingWindowPagination::class, $paginator, 15);