Custom Fields Error – Never Ending Loop

I am hoping somebody can help with this error! I am using an older version of WordPress and like the new WordPress better but for my own reasons I do not want to update.

When I am in the “write a page part” of the admin section I get a never ending loop that eventually crashes the browser. The function that does not seem to close is the custom fields. In the past, I just deleted the function out of the edit-page-form.php. But now I need the function, so I can add a custom field to pages and I can’t figure it out. If anybody knows how this could be fixed please let me know. Here is link to an image of the error. Here is a link to the php file that gets the error.