Maybe it was multiple issues then? Because I definitely had the code in the functions.php mentioned above by PaulHanaki. Perhaps it’s not forwarded, but it’s definitely displaying code for a site that is not mine and is not WP.
I had this issue, and have removed the code from each of the functions.php in my themes, but I’m still getting a blank page when I try to access the site. Is there anything else that needs to be cleaned up that I’m missing?