500 error if accessed by domain name, how to treat?

Question

Django

Good afternoon!
I'm trying to make the nginx + gunicorn + django bundle work according to this tutorial
. If you access the site by IP, everything works. If through a domain name - produces Internal server error.
Error log nginx empty
Access log:
If accessed by ip:
109.252.51.23 - - [26/Apr/2019:10:40:20 -0400] "GET /static/img/democracy.jpg HTTP/1.1" 304 0 " http ://155.254.*.* /static/css/app.css" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36"
If by domain name:
109.252.51.23 - - [26/Apr/2019:10:40:25 -0400] "GET / HTTP/1.1" 500 141 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML,
nginx settings

server {
    listen 80;
    listen [::]:80;

    server_name domain.com www.domain.com 155.254.*.*;

    location = /favicon.ico {
        access_log off;
        log_not_found off;
    }

    location /static/ {
        root /home/smartvote/smartvote;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }
}

I would be very grateful for help. I’ve been suffering all day (
Google didn’t help.
I apologize if the design of the post is not correct.