[Notice] Trying to get property of non-object

GET /kurse-and-anlaesse/ics/705/20190115T184500-20190319T210000

Line 1407 in /home/schweizi/public_html/event-calendar/code/Calendar.php

Source

1398 
1399 		}
1400 
1401 		if(is_numeric($id) && $oid) {
1402 
1403 			if(!$feed) { 
1404 
1405 				$event = DataObject::get_by_id($announcement ? $this->data()->getDateTimeClass() : $this->data()->getEventClass(), $id);
1406 
1407 				$FILENAME = $announcement ? preg_replace("/[^a-zA-Z0-9s]/", "", $event->Title) : $event->URLSegment;
1408 
1409 			}
1410 
1411 			else {
1412 
1413 				$FILENAME = preg_replace("/[^a-zA-Z0-9s]/", "", urldecode($_REQUEST['title']));

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