I finally found out the solution. I was wrong from the start. This code works for me, it can probably be optimized
<?php
$args = array(
'taxonomy' => 'marques-produits',
'orderby' => 'name',
'order' => 'ASC'
);
$cats = get_categories($args);
foreach($cats as $cat) {
if ($logo = get_field('logo_marque','marques-produits_'.$cat->term_id)) {
$cats_keep[] = $cat;
}
}
foreach($cats_keep as $cat) {
?>
<a href="<?php echo get_category_link( $cat->term_id ) ?>">
<img src="<?php echo esc_url($logo['url']); ?>" alt="<?php echo esc_attr($logo['alt']); ?>" />
</a>
<?php
}
?>
