protect against double-unrenderContentSkeleton
protect against double-unrenderContentSkeleton

oleg-babintsev/fullcalendar,arshaw/fullcalendar,fullcalendar/fullcalendar,fullcalendar/fullcalendar,arshaw/fullcalendar,kleisauke/fullcalendar,arshaw/fullcalendar,fullcalendar/fullcalendar,kleisauke/fullcalendar,arshaw/fullcalendar,kleisauke/fullcalendar,fullcalendar/fullcalendar,oleg-babintsev/fullcalendar,oleg-babintsev/fullcalendar,kleisauke/fullcalendar