undefined method `empty?' for 1:Integer

Trying to upgrade omnibus gitlab from 13.1.4 to 13.2.0 getting error

Error executing action `create` on resource 'template[/var/opt/gitlab/nginx/conf/gitlab-http.conf]'
...
undefined method `empty?' for 1:Integer

In my config I have:

...
        nginx['redirect_http_to_https'] = true
        nginx['proxy_set_headers'] = { 'X-GitLab-Show-Login-Captcha' => 1 }
        nginx['client_max_body_size'] = '2048m'
...

Please see log file:

gitlab-omnibus.log

Update: After remove

nginx['proxy_set_headers'] = { 'X-GitLab-Show-Login-Captcha' => 1 }

upgrade successfully.