In blog edit
<data name="Our Blogs" priority="6">
<xpath expr="//div[@id='blog_right_column']" position="inside">
<section class="mt32 mb32">
<h4>Our Blog</h4>
<ul class="nav nav-pills nav-stacked">
<t t-foreach="blogs" t-as="nav_blog">
<li t-att-class="nav_blog.id == blog.id and 'active' or ''">
<a t-attf-href="/blog/#{ slug(nav_blog) }">
<span t-field="nav_blog.name"/>
</a>
</li>
</t>
</ul>
</section>
</xpath>
</data>
line
<a t-attf-href="/blog/#{ slug(nav_blog) }">
creates
https://your_name.odoo.com/blog/-1
and it is necessary
https://your_name.odoo.com/blog/1
how to fix it?