[Plugin: Read Offline] Support / Feedback

Your site is down so I’m posting here. Your plugin causes rewrite rules flush every time you navigate through admin, I think that the problem is here:

function ps_read_offline_flush_rewrite_rules() {

			$rules = $GLOBALS['wp_rewrite']->wp_rewrite_rules(); // you have missed this line
			// without upper line this condition is always true :)
			if ( ! isset( $rules['read-offline/([^/]+)/([^\.]+).(pdf|epub|mobi)$'] ) ) {
				global $wp_rewrite;
	   			$wp_rewrite->flush_rules();
			}
    	}