[Plugin: Jetpack by WordPress.com] Jetpack Invalid Argument Supplied for foreach()

Hi! My WordPress site is set up for registered users. Contributors can submit posts, but when they submit their post, they are met with the following error referencing the Jetpack plugin:

Warning: Invalid argument supplied for foreach() in /home/craftcore/craftcore.ca/wp-content/plugins/jetpack/jetpack.php on line 1243

The code around that line is:

function admin_menu_order() {
	return true;
}
	function jetpack_menu_order( $menu_order ) {
		$jp_menu_order = array();
		foreach ( $menu_order as $index => $item ) {
			if ( $item != 'jetpack' )
				$jp_menu_order[] = $item;
			if ( $index == 0 )
				$jp_menu_order[] = 'jetpack';
		}
		return $jp_menu_order;
	}

Although the error comes up when contributors post a new blog, the post does submit properly.

Does anyone hae any advice?

http://wordpress.org/extend/plugins/jetpack/