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https://issues.apache.org/jira/browse/FLEX-28967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13612071#comment-13612071
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Carlos Rovira commented on FLEX-28967:
--------------------------------------
The Fix by miroslav.havrlent was tested and work successfully. It was
introduced in develop
> PopUpManagerImpl - centerPopUp method - TypeError: Error #1009: Cannot access
> a property or method of a null object reference
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: FLEX-28967
> URL: https://issues.apache.org/jira/browse/FLEX-28967
> Project: Apache Flex
> Issue Type: Bug
> Components: PopUp Manager
> Affects Versions: Adobe Flex SDK Previous
> Environment: Affected OS(s): All OS Platforms
> Affected OS(s): All OS Platforms
> Browser: Internet Explorer 8.x
> Language Found: English
> Reporter: Adobe JIRA
> Assignee: Carlos Rovira
> Labels: EasyFix
>
> Steps to reproduce:
> 1. using PopUpManager
>
> Error in the code:
> public function centerPopUp(popUp:IFlexDisplayObject):void
> {
> if (popUp is IInvalidating)
> IInvalidating(popUp).validateNow();
> const o:PopUpData = findPopupInfoByOwner(popUp);
>
> // If we don't find the pop owner or if the owner's parent is not
> specified or is not on the
> // stage, then center based on the popUp's current parent.
> var popUpParent:DisplayObject = (o && o.parent && o.parent.stage) ?
> o.parent : popUp.parent;
> if (popUpParent)
> {
> var systemManager:ISystemManager = o.systemManager;
> .
> .
> .
> .
> If const "o" is null, popUpParent is set to popUp.parent as stated by
> condition above.
> However in next step you assume that const "o" exists because you're asking
> for o.systemManager, but o is null.
> Therefore: TypeError: Error #1009: Cannot access a property or method of a
> null object reference
> Fix:
> public function centerPopUp(popUp:IFlexDisplayObject):void
> {
> if (popUp is IInvalidating)
> IInvalidating(popUp).validateNow();
> const o:PopUpData = findPopupInfoByOwner(popUp);
>
> var popUpParent:DisplayObject = (o && o.parent && o.parent.stage) ?
> o.parent : popUp.parent;
> if (popUpParent)
> {
> var systemManager:ISystemManager;
> if (o != null) {
> systemManager = o.systemManager;
> } else if (popUpParent.hasOwnProperty("systemManager"))
> {
> systemManager = popUpParent["systemManager"];
> } else if (popUpParent is ISystemManager) {
> systemManager = popUpParent as ISystemManager;
> }
>
> if (!systemManager)
> return; // or throw exception maybe ?
> .
> .
> .
> .
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