Bug: exception using 'updateEvent' and changing allDay from false to true

An exception occurs when a non-daily event is updated to be a daily event. Please see this fiddle (the event is automatically updated after 2 seconds).

VM2146 fullcalendar.js:650 Uncaught TypeError: Cannot read property 'clone' of null

The problems seems to arise in the mutateEvent() method:

...
normalizeEventDates(oldProps);  // <-- this will nullify oldProps.end because end == start (we strip the time so they will both be midnight of the original date)

// need to clear the end date if explicitly changed to null
clearEnd = event._end !== null && newProps.end === null;

// compute the delta for moving the start date
startDelta = diffDates(newProps.start, oldProps.start);

// compute the delta for moving the end date
if (newProps.end) {
	endDelta = diffDates(newProps.end, oldProps.end);  // <-- since oldProps.end is null, this raise an exception
	durationDelta = endDelta.subtract(startDelta);
}
...

[arshaw]

In a recent refactor, which is now pushed to master, this is fixed. test I made:

https://github.com/fullcalendar/fullcalendar/commit/0d69aca083f5d3e75ad3d47c2d94ea95be380400

will be release soon.

[arshaw]

Released in v3.5.0 (blog post)