Fitnesse - Error logging out

Hi, I'm running into an error at the end of the test.

As the test runs the included Log out and Tear Down, the system is presenting an error:

__EXCEPTION__:org.openqa.selenium.WebDriverException: unknown error: Cannot read property 'click' of null

I haven't touched the included static page for tear down, and I'm wondering what in the main script could affect this. It has worked in the recent past.

Thanks.

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