Rapidly moving mouse over and out of a custom Button skin with Transitions causes RTE

Steps to reproduce:
1.Compile and launch attached MXML file
2. Rapidly mouseover and mouseout of the button
3.

Actual Results:

RTE:

Main Thread (Suspended: TypeError: Error #1009: Cannot access a property or method of a null object reference.)
spark.primitives.supportClasses::GraphicElement/get filters
spark.effects::AnimateTransitionShader/getValueFromTarget
mx.effects::Effect/http://www.adobe.com/2006/flex/mx/internal::captureValues
mx.effects::CompositeEffect/http://www.adobe.com/2006/flex/mx/internal::captureValues
mx.effects::CompositeEffect/http://www.adobe.com/2006/flex/mx/internal::captureValues
mx.effects::CompositeEffect/captureStartValues
mx.core::UIComponent/commitCurrentState
mx.core::UIComponent/setCurrentState
mx.core::UIComponent/set currentState
spark.components.supportClasses::SkinnableComponent/commitProperties
spark.components.supportClasses::ButtonBase/commitProperties
mx.core::UIComponent/validateProperties
mx.managers::LayoutManager/validateProperties
mx.managers::LayoutManager/doPhasedInstantiation
mx.managers::LayoutManager/doPhasedInstantiationCallback

Expected Results:

No RTE

Workaround (if any):

Remove the AddAction and RemoveAction tags.