Home page redirection problem

gitlab is installed using the rpm package manager.

On the gitlab login page, the browser path is ‘users/sign_in’ After a successful login, it automatically redirects to ‘/null’. here are the nginx log contents: ‘*. *. . * - - [14/Aug/2022:12:14:23 +0800] “GET /null HTTP/2.0” 404 9994 “https://**.com:9999/null” “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36” 5.69’ Sensitive information replaced with '

What should I do?