Fixing warning "Undefined index: WPACFallback"

Hello,

I’me developing a site using your plugin with debug mode enabled and I’ve found this warning on each comment box:

Notice: Undefined index: WPACFallback in PATH\localhost\test\wp-content\plugins\wp-ajaxify-comments\wp-ajaxify-comments.php on line 667

Checking that line:

if ($_REQUEST['WPACFallback'] || wpac_is_ajax_request()) return $query;

I’ve fixed it by replacing that line for this one:

if ((isset($_REQUEST['WPACFallback']) && $_REQUEST['WPACFallback']) || wpac_is_ajax_request()) return $query;

I’m not sure if I’ve fixed it in a proper way or I messed something up elsewhere. Could you tell me if I’m right? Thanks.

Best regards.

http://wordpress.org/plugins/wp-ajaxify-comments/