fix: avoid null pointer exception

public/typo3conf/ext/ep_products/Classes/Controller/TravelinfoController.php

@@ -47,6 +47,14 @@ class TravelinfoController extends ActionController
         /** @var Date $date */
         $date = $this->dateRepository->findOneByCode($travelCodeDate);
 
+        if (null === $date) {
+            $response = GeneralUtility::makeInstance(ErrorController::class)->pageNotFoundAction(
+                $GLOBALS['TYPO3_REQUEST'],
+                'Termin nicht gefunden'
+            );
+            throw new ImmediateResponseException($response, 1731071856);
+        }
+
         $product = $date->getProduct();
 
         if (null === $product) {