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https://issues.apache.org/jira/browse/FLEX-35369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Hall updated FLEX-35369:
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Summary: RTE: DragProxy Error (was: DragProxy Error)
> RTE: DragProxy Error
> --------------------
>
> Key: FLEX-35369
> URL: https://issues.apache.org/jira/browse/FLEX-35369
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: Window
> Affects Versions: Apache Flex 4.16.0
> Environment: Windows 10
> Reporter: John Hall
> Fix For: Apache Flex 4.16.1
>
>
> Working with NativeDragDrop on occasion I get the following error
> TypeError: Error #1009: Cannot access a property or method of a null object
> reference.
> at
> mx.managers.dragClasses::DragProxy/mouseUpHandler()[/Users/justinmclean/Documents/ApacheFlex4.16/frameworks/projects/framework/src/mx/managers/dragClasses/DragProxy.as:660]
>
> at
> mx.managers.dragClasses::DragProxy/mouseLeaveHandler()[/Users/justinmclean/Documents/ApacheFlex4.16/frameworks/projects/framework/src/mx/managers/dragClasses/DragProxy.as:561]
>
> at flash.events::EventDispatcher/dispatchEventFunction()
> at flash.events::EventDispatcher/dispatchEvent()
> at
> mx.managers::WindowedSystemManager/mouseLeaveHandler()[/Users/justinmclean/Documents/ApacheFlex4.16/frameworks/projects/airframework/src/mx/managers/WindowedSystemManager.as:2306]
>
> Alex Harui's comment on the forum was:
> _Hi,
> The stack trace points out a legitimate bug. If the Drag starts, but then
> the mouse goes out of the app and the button is released without any
> mouseMove events coming into the DragProxy, the lastMouseEvent has not
> been set and you'll get this crash.
> I'm not quite sure how you can get zero "mouseMove" events, but maybe if
> you drag fast enough while the app is computing the thing to drag.
> File a bug if you can. You shouldn't need to build the SDK to fix this
> problem. You can use monkey-patching instead. Search the internet for
> articles on "Flex Monkey Patching".
> Thanks,
> -Alex
> _
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