Sorry to see that your question hasn’t received an answer yet. Unfortunately, without more information, it is unlikely that an answer for this specific issue can be provided. For people still landing here via search, running a Next.js app in production is much like running any Node app. Check out this tutorial for all the details on getting a Node app running behind an Nginx reverse proxy:

• How To Set Up a Node.js Application for Production on Ubuntu 16.04

you need to delete other location
and put this conf
you can see image https://i.imgur.com/uw8EIaW.png
ip finder

location / {
 proxy_set_header Host $host;
 proxy_pass https://stats.uptimerobot.com;
 }