Fake Client Login

Hi fellas, basically I am running a photography site on WordPress. I wanted to have specific pages for clients where they can go in to see their photos. I’ve done it with a password protected page. But I also wanted to have a page where a client can put in the page id on a field that will take them to their private page.

I’ve done it with a script I found a while ago.

Client Login page (They simply enter the page id number)
[Code moderated as per the Forum Rules. Please use the pastebin]

Basically it works, but when I try to upload an image when writing a blog post, it throws up a red “Http Error” message. I’ve narrowed down the problem to this specific little plugin. It’s probably not the best solution, but I would like to see this work without breaking my WP install. So my question is, is there something wrong within the code that conflicts with WordPress?

If you have any other ideas that could replace this whole solution, would love to hear it.

Thanks!