Error : E_WARNING

Attempt to read property "room" on null

1
/kunden/431424_13355/webseiten/subdomains/app2023.daga-tagung.de/conf/frontend/conference/controller/ControllerContentConference.php, line 516
513.             $oSession = $oSessions->findById($iSessionId);
514. 
515.             // Get room name
516.             $iRoomId = $oSession->room;
517.             $oRooms = new \memyc\feuser\conference\Model('memyc\beuser\conference\entity\room');
518.             $oRoom = $oRooms->findById($iRoomId);
519.