Problem with sitemap

Hello,

I need help with the sitemap. I have a problem with one reference to sitemap_index specifically with the page tag. Ten sitemap.index.xml. there http://www.vlasyaucesy.cz/sitemap_index.xml, all links are working, except http://www.vlasyaucesy.cz/post_tag-sitemap3.xml that I report error 404. I guess it’s logical, because he does not exist, because the tag does not exist so much.

Thank you for your help.
Pavel

https://wordpress.org/plugins/wordpress-seo/