WPF DataGrid，添加行时应用程序崩溃

I have a wpf datagrid bound to a TrackableCollection. In some rare occations, and for only a few selected users, the application will crash when the user adds a new record by entering the bottom blank row. I have not been able to reproduce the issue, and all I have is a stacktrace of the exception thrown. Has anyone seen anything like this? I have limited knowledge about the automationpeer-classes, but I can confirm that we are not using any of them in our application.I have a wpf datagrid bound to a TrackableColle