The indication is that the object somehow got removed from the displaylist on the mouseDown.
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of florian.salihovic Sent: Wednesday, December 10, 2008 4:11 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] UIMovieClip shows nondeterministic behaviour I have a pretty big application. The app uses various in Flash created components. Everything works fine untill some certain point, which varies from test to test. At some point, my app crashes with a typeerror: TypeError: Error #1009: Cannot access a property or method of a null object reference. at mx.flash::UIMovieClip/removeFocusEventListeners()[E:\dev\trunk\frameworks\projects\flash-integration\src\mx\flash\UIMovieClip.as:2466] at mx.flash::UIMovieClip/focusOutHandler()[E:\dev\trunk\frameworks\projects\flash-integration\src\mx\flash\UIMovieClip.as:2509] at flash.display::Stage/set focus() at mx.core::UIComponent/setFocus()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\core\UIComponent.as:6797] at mx.managers::FocusManager/setFocus()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\managers\FocusManager.as:396] at mx.managers::FocusManager/mouseDownHandler()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\managers\FocusManager.as:1388] The stacktrace is not that helpfull to me... seems a similar problem like: http://bugs.adobe.com/jira/browse/SDK-13182 The error is not reproduceable/hard to reproduce, since it happens randomly when trying to remove some displayobjects... Any infos or help would be appreciated!