Fatal error on homepage

Hello again!

I just installed the update (2.5) on my site and it gave me this error on the site home page:

Fatal error: Call to a member function get_var() on a non-object in […]/wordpress/wp-content/plugins/back-end-instructions/instructions.php on line 496

(The […] is my edit. I’m using Twenty Eleven as a theme, and I’ve deactivated all other plugins to make sure it’s not a conflict.)

If I replace line 495 with this:
global $post, $wpdb;
The error goes away, but I just wanted to make sure that this is actually a solution and not just hiding the problem.

Again, thanks for the awesome plugin (and the awesome support)! Everything else is running super smoothly. 🙂

http://wordpress.org/extend/plugins/back-end-instructions/