php - orderby 'meta_value_num' is breaking my WP_Query

I'm having an issue when trying to order myWP_Query by a numeric ACF field. I've seen a few similar posts on here but none have been able to to help me resolve me issue.

Here are the args to my query:

                  $args = array (
                    'post_type' => 'kb',
                    'post_status' => 'publish',
                    'meta_key' => 'order_in_list',
                    'orderby' => 'meta_value_num',
                    'order' => 'ASC',
                    'tax_query' => array (
                      array (
                        'taxonomy' => 'product',
                        'field' => 'term_id',
                        'terms' => $cat->term_id,
                      )
                    ),
                  );  
Copy code

order_in_list is the name of an ACF number field that exists on all posts of type 'kb'.

The above query currently returns nothing, however if I comment out themeta_key line in theargs, it works fine. Does anyone have any idea what I'm doing wrong here?

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