diff --git a/web/typo3conf/ext/ep_products/Classes/Traits/RequestArgumentTypeConversionTrait.php b/web/typo3conf/ext/ep_products/Classes/Traits/RequestArgumentTypeConversionTrait.php
index fa5271f5..c24449f1 100644
--- a/web/typo3conf/ext/ep_products/Classes/Traits/RequestArgumentTypeConversionTrait.php
+++ b/web/typo3conf/ext/ep_products/Classes/Traits/RequestArgumentTypeConversionTrait.php
@@ -94,8 +94,8 @@ trait RequestArgumentTypeConversionTrait
                 $filterSettings['dateFrom'] = !empty($filterSettings['dateFrom']) ? new \DateTime($filterSettings['dateFrom']) : null;
                 $filterSettings['dateTo'] = !empty($filterSettings['dateTo']) ? new \DateTime($filterSettings['dateTo']) : null;
 
-                if (!empty($filterSettings['bus']) && is_string($filterSettings['bus'])) {
-                    $filterSettings['bus'] = ($filterSettings['bus'] === 'true');
+                if (!empty($filterSettings['bus'])) {
+                    $filterSettings['bus'] = (bool) $filterSettings['bus'];
                 }
 
                 $filterSettingsObject = new FilterSettings();