I tried to redirect an specifique url

this url is "/competitors?sort=name_categories.name" to "/articles"

my conf is :

server {
...
location ~* ^/competitors(.*)$ {
if ($args ~* ^sort=name_categories.name$){
set $args "";
rewrite ^(.*)$ $scheme://$host/articles redirect;
break;
}
}
location / {
....
}
}

this code work perfecltly for the url /competitors?sort=name_categories.name but i can't acces to /competitors now ...

You can help me ?
Thanks.