duplicate "log_format" name "vhost" in /etc/nginx/conf.d/default.conf:72

Iam using below custom-log-format.conf file for jwilder/nginx-proxy. Everything is working well initially. i can access the nginx and i got all logs in my custom log file,

custom-log-format.conf:

log_format vhost '$remote_addr - $remote_user $time_iso8601 [$request_time] '
                       '"$request" $status $body_bytes_sent '
                       '"$http_referer" "$http_user_agent" '
                       $remote_user $time_iso8601 [$request_time] ;

access_log /var/log/nginx/access_custom.log vhost;

But when i restart the container i got duplicate log_format error in nginx container. My only problem is when i restart the container i got the duplicate error. Otherwise when i start the container with the below command, it is working good.

Error:

nginx.1     | 2025/10/24 06:36:15 [emerg] 321#321: duplicate "log_format" name "vhost" in /etc/nginx/conf.d/default.conf:72
nginx.1     | nginx: [emerg] duplicate "log_format" name "vhost" in /etc/nginx/conf.d/default.conf:72
forego      | starting nginx.1 on port 34700
nginx.1     | 2025/10/24 06:36:15 [emerg] 322#322: duplicate "log_format" name "vhost" in /etc/nginx/conf.d/default.conf:72
nginx.1     | nginx: [emerg] duplicate "log_format" name "vhost" in /etc/nginx/conf.d/default.conf:72
forego      | starting nginx.1 on port 34800

Command:

docker run -d   -p 80:80 -p 443:443   --name nginx-proxy   --network nginx-proxy   -v /mnt/certs:/etc/nginx/certs   -v /mnt/agent_deploy.sh:/usr/local/agent_deploy.sh   -v /var/run/docker.sock:/tmp/docker.sock:ro  -v /mnt/ApplicareSingleAgentLinux:/usr/local/ApplicareSingleAgentLinux   -v /mnt/custom-log-format.conf:/etc/nginx/conf.d/custom-log-format.conf:ro  --hostname nginx   jwilder/nginx-proxy

I tried the log_format and access_log name in custom-log-format.conf file from vhost to custom_vhost but if i changed that name the nginx is not working when i start the container initially, i got 503 error on container.

Please help me to resolve that issue.