There's a line in includes/spiders.txt that has wget listed (by default). Go to your includes folder and remove the line of wget. Then wait for the next run.
This *SHOULD* fix the problem as I'm running the cron now and am not getting this error.
That or you can edit checkout_by_amazon.php and add:
PHP Code:
define('SESSION_BLOCK_SPIDERS','False');
to it instead.
Bookmarks