diff --git a/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php b/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php
index d4aaa788..d7230c49 100644
--- a/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php
+++ b/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php
@@ -113,7 +113,7 @@ class IcalService implements SingletonInterface
             $occupancy = $event->getOccupancy();
         }
 
-        if (!isset($item['to'])) {
+        if (isset($event) && !isset($item['to'])) {
             $item['to'] = $event->getEnd();
             $this->addOccupancyItem($item);
         }