Log Name: Application
Source: Microsoft-SharePoint Products-SharePoint Foundation
Date: 11/17/2011 4:32:23 AM
Event ID: 6398
Task Category: Timer
The Execute method of job definition Microsoft.SharePoint.Administration.SPSqmTimerJobDefinition (ID 64e5b062-23fc-4501-8339-4154830b1591) threw an exception. More information is included below.
Data is Null. This method or property cannot be called on Null values.
Go to Central Admin - monitoring - review job definitions - job history (left) and change the view (right) to Failed jobs. Click on Failed link and you should get similar error messages logged. Review the job (check configuration) to fix and if not needed disable it.
That's the "Customer Experience Improvement Program" and you can safely disable it.