Browser Page Goes Blank While Updating Website

Yes, I have twenty fifteen theme in the theme folder.

So do I upload that theme, then re-install the agency theme to have it revert back to it?? Will I lose anything?

are you sure you doing this for same website or might be changing for some other website on server? because it works without a issue.

try these steps then
https://www.inmotionhosting.com/support/edu/wordpress/change-theme-in-db

get database name from wp-config.php file.

I only have the one website. I’m not sure of anything at this point. I’ll try changing the theme in the database to see if that works.

Well, it worked. I was able to get back to my wp-admin area. I am having a bit of trouble trying to get into the original theme’s file to remove the code I installed that caused the error.

match it with original functions.php file. you can make out the xtra code.

or start with original theme but your settings done on old theme will be lost.

Got it! You have been a tremendous help. I can’t thank you enough. Saved me from having to re-do months of work. All the best to you my friend!

Happy to help, can you please mark this topic as resolved.