The taxonomy contains mostly 3 levels, sometimes two levels only.

  Child 1
    Grandchild 1
  Child 2

Via path alias, the patterns create URLs like:


When I configure my views block with the logic for the grandchild and place this blog into the layout builder of the taxonomy, it's working like a charm. enter image description here

Only when I hit the the URL of the child (not grandchild) I get the error:

Drupal\Core\Database\InvalidQueryException: Query condition 'taxonomy_term_field_data.name IN ()' cannot be empty. in Drupal\Core\Database\Query\Condition->condition() (line 117 of core/lib/Drupal/Core/Database/Query/Condition.php).

(which seems to make sense, since there is not 3rd component in my path - /parent/child2)

How to "catch" the request without a 3rd component or how can I validate either component 3 or 2 (and I'd need 1 as well in some cases).

  • The easiest way is just to have 2 blocks within your view. 1 looking for arg3 and 1 looking for arg 2 Commented Mar 20, 2023 at 13:26
  • That would be fine. Issue is just the error. How to make sure, if there is no arg3, then I'd only show results for arg2?
    – Chris
    Commented Mar 22, 2023 at 18:32
  • Settings for the contextual filter already give you that option. What did you choose below the Specify validation criteria? Do you have 2 Contextual filters, one for child, another for grandchild, in correct order, and with correct Relationships?
    – prkos
    Commented Mar 22, 2023 at 20:39
  • I couldn't get it working via the path. Now I'm using Content: Has taxonomy term ID as a contextual filter and it works directly for all depths and even with special characters.
    – Chris
    Commented Mar 24, 2023 at 5:12


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