[FLEX-16190] Unloading a swf that includes a ViewStack can cause a RTE

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: Adobe Flex SDK Previous
• Component/s: Sample Apps
• Environment: Affected OS(s): All OS Platforms; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 18/Oct/08 20:11
• Updated: 15/Apr/11 15:24
• Resolved: 21/Oct/08 11:36

Description

Steps to reproduce in Flex Explorer:
1. Compile the explorer samples
2. Run explorer.html
3. Select the LinkButton Sample

Steps to reproduce in the bugfile:
1. Run testLinkButton.swf
2. Alternate clicking the two buttons at the bottom which switches the source of the SWFLoader.
You will eventually get a RTE after unloading the ViewStack application a few times.

Actual Results: RTE -
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.managers::HistoryManagerImpl/calcCRC()
at mx.managers::HistoryManagerImpl()
at mx.managers::HistoryManagerImpl$/getInstance()
at mx.core::Singleton$/getInstance()
at mx.managers::HistoryManager$/get impl()
at mx.managers::HistoryManager$/unregister()
at mx.containers::ViewStack/removedFromStageHandler()
at flash.display::Loader/_unload()
at flash.display::Loader/unload()
at mx.controls::SWFLoader/load()
at mx.controls::SWFLoader/commitProperties()
at mx.core::UIComponent/validateProperties()
at mx.managers::LayoutManager/validateProperties()
at mx.managers::LayoutManager/doPhasedInstantiation()
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.core::UIComponent/callLaterDispatcher2()
at mx.core::UIComponent/callLaterDispatcher()

Expected Results: no RTE

Workaround (if any):