I make web shops for bakers with my own CMS. Some bakers already have a WordPress site, then I can insert my webshop via Advanced Iframe Pro. This works fine, for both the bakers and me. But I have a problem with iFrame (discovered by a customer from the baker). I use the setting Map parameter to url/ Use parameter value as iframe url= page and URL foreward parameters = ALL This is necessary (I believe) because the bakers use assortments, which open on a new page in the iFrame. The URL looks like this: https://www.bakkerij.nl/webshop/?page=/assortiment/brood If you change the URL to https://www.bakkerij.nl/webshop/?page=https://www.stackoverflow.com then stackoverflow.com opens in the iFrame. How do I prevent this? So if there is no /assortment behind ?page= that the main webshoppage opens instead of stackoverflow.com? I have tried adjusting some settings, but don't know enough of it to know what I'm doing. And nothing changed anyhow.