Recurring event with reversed end and start date break a whole calendar

java.lang.IllegalArgumentException: Range start must be before range end
	at net.fortuna.ical4j.model.DateRange.<init>(DateRange.java:71)
	at net.fortuna.ical4j.model.Period.<init>(Period.java:88)
	at net.fortuna.ical4j.model.Component.calculateRecurrenceSet(Component.java:366)
	at org.olat.commons.calendar.manager.ICalFileCalendarManager.getRecurringEventsInPeriod(ICalFileCalendarManager.java:1378)
	at org.olat.commons.calendar.manager.ICalFileCalendarManager.getEvents(ICalFileCalendarManager.java:1300)
	at org.olat.commons.calendar.ui.components.FullCalendarMapper.collectKalendarEvents(FullCalendarMapper.java:120)
	at org.olat.commons.calendar.ui.components.FullCalendarMapper.handle(FullCalendarMapper.java:95)