RTE when running crossfade if it is already a runnin'

Found in Flex 4.1.0.15465

Steps to reproduce:
1. Compile and run attached MXML file.

<?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"
width="400" height="400">

<fx:Declarations>
<s:CrossFade id="e_CrossFade" target="

"/>
</fx:Declarations>

<s:Button id="button" width="300" height="300"
label="Click Repeatedly to Crash" click="e_CrossFade.play();"/>

</s:Application>

2. Click the button a few times (slowly). It's all good, y'all.
3. Double click the button to cause the effect to run again while already running.

Actual Results:
ArgumentError: Error #2015: Invalid BitmapData.
at flash.display::DisplayObject/set filters()
at mx.core::UIComponent/set filters()[E:\dev\trunk\frameworks\projects\framework\src\mx\core\UIComponent.as:3346]
at spark.effects.supportClasses::AnimateTransitionShaderInstance/setValue()[E:\dev\trunk\frameworks\projects\spark\src\spark\effects\supportClasses\AnimateTransitionShaderInstance.as:361]
at spark.effects.supportClasses::AnimateInstance/applyValues()[E:\dev\trunk\frameworks\projects\spark\src\spark\effects\supportClasses\AnimateInstance.as:510]
at spark.effects.supportClasses::AnimateInstance/animationUpdate()[E:\dev\trunk\frameworks\projects\spark\src\spark\effects\supportClasses\AnimateInstance.as:669]
at spark.effects.animation::Animation/sendUpdateEvent()[E:\dev\trunk\frameworks\projects\spark\src\spark\effects\animation\Animation.as:816]
at spark.effects.animation::Animation/doInterval()[E:\dev\trunk\frameworks\projects\spark\src\spark\effects\animation\Animation.as:796]
at spark.effects.animation::Animation$/timerHandler()[E:\dev\trunk\frameworks\projects\spark\src\spark\effects\animation\Animation.as:688]
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()

Expected Results:
No RTE.

Workaround (if any):
Check to see if the effect is already playing before trying to play it again (weaksauce):

<s:Button id="button" width="300" height="300"
label="Click Repeatedly to Crash" click="if (!e_CrossFade.isPlaying) e_CrossFade.play();"/>