Hi @mmjaeger
Could you please try this code?
$args = array(
'post_type' => 'ze_knowledge',
'orderby' => 'post_date',
'order' => 'DESC',
'posts_per_page'=> '-1',
'meta_query' => array(
'key' => 'knowledge_field',
'compare' => '!=',
'value' => '',
)
);
I hope this helps.