diff --git a/Classes/Domain/Repository/CategoryRepository.php b/Classes/Domain/Repository/CategoryRepository.php
index 5c2590c7..2b8292dc 100644
--- a/Classes/Domain/Repository/CategoryRepository.php
+++ b/Classes/Domain/Repository/CategoryRepository.php
@@ -33,7 +33,7 @@ public function initializeObject(): void
             GeneralUtility::makeInstance(Context::class),
             $configurationManager
         );
-        $querySettings->setStoragePageIds(GeneralUtility::intExplode(',', $this->settings['persistence']['storagePid']));
+        $querySettings->setStoragePageIds(GeneralUtility::intExplode(',', (string)$this->settings['persistence']['storagePid']));
         $this->setDefaultQuerySettings($querySettings);
 
         $this->defaultOrderings = [
diff --git a/Classes/Domain/Repository/PostRepository.php b/Classes/Domain/Repository/PostRepository.php
index 84fab51c..3ee7aa83 100644
--- a/Classes/Domain/Repository/PostRepository.php
+++ b/Classes/Domain/Repository/PostRepository.php
@@ -414,7 +414,7 @@ public function findRelatedPosts(int $categoryMultiplier = 1, int $tagMultiplier
 
     protected function getStoragePidsFromTypoScript(): array
     {
-        return GeneralUtility::intExplode(',', $this->settings['persistence']['storagePid']);
+        return GeneralUtility::intExplode(',', (string)$this->settings['persistence']['storagePid']);
     }
 
     /**
diff --git a/Classes/Domain/Repository/TagRepository.php b/Classes/Domain/Repository/TagRepository.php
index 7bbdee72..b38cde19 100644
--- a/Classes/Domain/Repository/TagRepository.php
+++ b/Classes/Domain/Repository/TagRepository.php
@@ -57,7 +57,7 @@ public function findTopByUsage(int $limit = 20): array
         // limitation to storage pid for multi domain purpose
         if ($this->settings['persistence']['storagePid']) {
             // force storage pids as integer
-            $storagePids = GeneralUtility::intExplode(',', $this->settings['persistence']['storagePid']);
+            $storagePids = GeneralUtility::intExplode(',', (string)$this->settings['persistence']['storagePid']);
             $queryBuilder->where('t.pid IN(' . implode(',', $storagePids) . ')');
         }