mx:Form crashes at runtime with an empty spark label as children

Steps to reproduce:
1. Compile and run code attached.
=================
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768">
<mx:Form>
<mx:FormItem label="form item label">
<s:Label/>
</mx:FormItem>
</mx:Form>
</s:Application>
================

Actual Results:
The page does not render and stays blocked with the loading bar at 100%.

Expected Results:
A form, with a formItem and an empty label should appear.

Workaround (if any):