[FLEX-20394] Exceptions when flash player loses focus and gets back

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Adobe Flex SDK Previous
• Component/s: Focus Manager
• Environment: Affected OS(s): Windows; Affected OS(s): Windows XP; Language Found: English
• Assignee: Unassigned
• Reporter: Adobe JIRA
• Created: 29/Jul/09 17:17
• Updated: 15/Apr/11 15:13

Description

Steps to reproduce:
1. Create an instance of a component(ex. Image) and put on stage.
2. Run the app
3. Click outside the app, i.e. lose focus of flash app by clicking on some other window, then click back on the component.

Note: This bug is a bit hard to reproduce.

Actual Results:
A runtime error is thrown, with the following stack trace:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.managers.marshalClasses::FocusManagerMarshalMixin/getTopLevelFocusTargetHandler()[E:\dev\trunk\frameworks\projects\framework\src\mx\managers\marshalClasses\FocusManagerMarshalMixin.as:311]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.managers::FocusManager/getTopLevelFocusTarget()[E:\dev\trunk\frameworks\projects\framework\src\mx\managers\FocusManager.as:1445]
at mx.managers::FocusManager/mouseDownHandler()[E:\dev\trunk\frameworks\projects\framework\src\mx\managers\FocusManager.as:1870]

Expected Results:
The app should get focus without any exceptions.

Workaround (if any):
None.