[Notice] Trying to get property of non-object

GET /fahrtenprogramm/ics/announcement-50/20190504T-20190504T

Line 725 in /www/htdocs/w01956f7/kwc-grefrath.de/event_calendar/code/Calendar.php

Source

716 			$id = str_replace("announcement-","",$id);
717 			$announcement = true;
718 		}
719 		else {
720 			$announcement = false;
721 		}
722 		if(is_numeric($id) && $oid) {
723 			if(!$feed) { 
724 				$event = DataObject::get_by_id($announcement ? $this->data()->getDateTimeClass() : $this->data()->getEventClass(), $id);
725 				$FILENAME = $announcement ? preg_replace("/[^a-zA-Z0-9s]/", "", $event->Title) : $event->URLSegment;
726 			}
727 			else {
728 				$FILENAME = preg_replace("/[^a-zA-Z0-9s]/", "", urldecode($_REQUEST['title']));
729 			}
730 
731 			$FILENAME .= ".ics";

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