Using a parallel task library in a Windows Phone application throws a ThreadAbortException

I use TPL in my wp7 application for some background manipulations.

The application launches the task:

var task =
    Task.Factory.StartNew(
        () =>
        {
            // Some sort of operations
        });

After that, the application launches user interface updates:

task.ContinueWith(
    obj =>
    {
        // UI updates
    },
    new CancelationSource.Token,
    TaskContinuationOptions.None,
    TaskScheduler.FromCurrentSynchronizationContext());

But there's a problem. If I click the back button to close the application and the task is not finished yet, the application throws an AggregateException with an internal exception ThreadAbortException. As I understand it, this is because the reverse flow ended incorrectly.

How can I prevent this? Maybe there is some right way to cancel the task?

I have only one idea - to catch this exception and pretend that nothing happened. Correctly?