Web Template - Knowledge base Home URL

Hello there,

I'm having some issues with my categories links. It seems like this part of the code here is not working

<a href="{{ category_url | add_query: 'id', category.categorynumber }}" class="list-group-item">

The screenshot above is from my other portal (CSS). I only have "...microsoftcrmportals.com/knowledgebase"

I'm missing the "/category/?id=CAT-XXXX" part.

Thank you,

Romark