diff --git a/public/typo3conf/ext/ep_products/Classes/Domain/Model/Dto/GroupsPriceInquiry.php b/public/typo3conf/ext/ep_products/Classes/Domain/Model/Dto/GroupsPriceInquiry.php
index 141ce4e0..0a9d3ad7 100644
--- a/public/typo3conf/ext/ep_products/Classes/Domain/Model/Dto/GroupsPriceInquiry.php
+++ b/public/typo3conf/ext/ep_products/Classes/Domain/Model/Dto/GroupsPriceInquiry.php
@@ -431,7 +431,7 @@ class GroupsPriceInquiry
      */
     public function getEffectivePax()
     {
-        return max(30, $this->getPax() - $this->getChildren());
+        return max(30, (int) $this->getPax() - (int) $this->getChildren());
     }
 
     /**