The Office Communications Server 2007 R2 Group Chat client crashes when you try to log off or try to shut down the computer

Symptoms

On a computer that is running the Microsoft Office Communications Server 2007 R2 Group Chat client, you try to log off or try to shut down the computer. In this situation, the Group Chat client crashes. Additionally, you receive the following error message:

System.NullReferenceException: Object reference not set to an instance of an object.

Resolution

To fix this problem, install the following cumulative update:

2491979 Description of the update for Office Communications Server 2007 R2 Group Chat client: March, 2011

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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