canvas page on facebook keeps reloading

I point the Canvas URL to my website using iframe. After my facebook account and the local drupal account is connected, the canvas URL will keep on reloading. Apparently it has the following code at the end of the iframe page:

<script type="text/javascript">window.location = ""</script>

And I think it has something to do with the following code

    // Refresh the page.
    drupal_add_js('window.location = ""', 'inline', 'footer');