Apologies for my brain,
But could you give an example?
At the moment i’m playing with this:
$_POST[‘http://www.google.com’%5D = add_query_arg( array(‘post_id’ => $post_id), $_POST[‘http://www.google.com’%5D );
How did you end up fixing this? I have the same problem, Blank page (with same address) when the form is submitted, however it still goes through.