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https://issues.apache.org/jira/browse/FLEX-33745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772899#comment-13772899
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Vitali Kabak commented on FLEX-33745:
-------------------------------------
If you try to open a modal popup window when screen reader is active
(Accessibility.active is true) and you project is compiled with unchecked
"Generate accessible SWF", and another popup is present at the moment (even
invisible, like closed PopUpMenuButton), you will get errors while opening and
closing popup.
SDK 4.6 and 4.9.1 are also affected
Possible solution: make sure [Object].accessibilityProperties != null before
accessing "accessibilityProperties.silent" property.
> Null error in the PopupManagerImpl if accessibility is deactivated
> ------------------------------------------------------------------
>
> Key: FLEX-33745
> URL: https://issues.apache.org/jira/browse/FLEX-33745
> Project: Apache Flex
> Issue Type: Bug
> Components: PopUp Manager
> Affects Versions: Apache Flex 4.10.0
> Reporter: Benjamin Chalupka
> Labels: nullpointerexception, popupmanager
> Original Estimate: 10m
> Remaining Estimate: 10m
>
> During the removal of a popup this error appears:
> TypeError: Error #1009: Cannot access a property or method of a null object
> reference.
> at
> mx.managers::PopUpManagerImpl/removeModalPopUpAccessibility()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/framework/src/mx/managers/PopUpManagerImpl.as:1513]
> at
> mx.managers::PopUpManagerImpl/popupRemovedHandler()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/framework/src/mx/managers/PopUpManagerImpl.as:1251]
> at flash.display::DisplayObjectContainer/removeChild()
> at
> mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::rawChildren_removeChild()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/framework/src/mx/managers/SystemManager.as:2152]
> at
> mx.managers::SystemManager/removeChild()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/framework/src/mx/managers/SystemManager.as:1795]
> at
> mx.managers::PopUpManagerImpl/removePopUp()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/framework/src/mx/managers/PopUpManagerImpl.as:662]
> at
> mx.managers::PopUpManager$/removePopUp()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/framework/src/mx/managers/PopUpManager.as:238]
> The fix should be to simply add a check if the accessibilityProperties
> property is null or expand the try catch block around it.
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