Error when using WP in folder

Hi,

I have WP in folder and url is root. When I’m editing help I get this error:
: Trying to get property ‘id’ of non-object in /home/public_html/domain.com/wp-folder/wp-content/plugins/wp-help/classes/plugin.php on line 107.

And I see that plugin is calling:
GET https://domain.com/wp-json/wp/v2/users/me?_locale=user 403

So subfolder is missing. and all calls are 403, of course.

Any help from developer?