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A web application in Internet Explorer 9 may throw an exception that indicates that a global variable is not defined or is inaccessible

Symptoms
You develop a web application that uses global variables. Under certain conditions in Windows Internet Explorer 9, a given variable seems to be undefined or inaccessible, especially in very quick looping calls. When the issue occurs, the web application throws an exception that indicates that the global variable is not defined or is inaccessible from the child window.
Cause
This issue occurs because of a problem in the script engine of Internet Explorer 9.
Resolution
To resolve this problem, install the update that is described in this section.

Security update information

To resolve this problem, install the most recent cumulative security update for Internet Explorer. To do this, go to the following Microsoft website:For more technical information about the most recent cumulative security update for Internet Explorer, go to the following Microsoft website:Note This update was first included in security update 2722913. For more information about this security update, click the following article number to view the article in the Microsoft Knowledge Base:
2722913 MS12-052: Cumulative Security Update for Internet Explorer: August 14, 2012

Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Properties

Article ID: 2730570 - Last Review: 08/15/2012 07:48:00 - Revision: 3.0

Windows Internet Explorer 9

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