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Reported for: WPML SEO 2.1.0

Topic Tags: Compatibility

Overview of the issue

When using the Rank Math SEO plugin, the primary category set for a product or post in the default language does not synchronize to its translations. This issue persists even if you set the rank_math_primary_product_cat custom field as copy.


Please, make sure of having a full backup of your site before proceeding.

  • Open theme’s functions.php file.
  • Add the following code:
    // compsupp-6580: sync primary term and primary product terms for Rank Math
    add_filter('get_post_metadata', 'compsupp6580_filter_the_post_metadata', 20, 4);
    function compsupp6580_filter_the_post_metadata($value, $postId, $key, $single)
    	$meta_keys_mapping = array(
    		'rank_math_primary_category'    => 'category',
    		'rank_math_primary_product_cat' => 'product_cat',
    	if (in_array($key, array_keys($meta_keys_mapping), true)) {
    		remove_filter('get_post_metadata', 'compsupp6580_filter_the_post_metadata', 20);
    		$value = get_post_meta($postId, $key, true);
    		add_filter('get_post_metadata', 'compsupp6580_filter_the_post_metadata', 20, 4);
    		$args     = [
    			'element_id'   => $postId,
    			'element_type' => get_post_type($postId),
    		$language = apply_filters('wpml_element_language_code', false, $args);
    		$value    = apply_filters('wpml_object_id', $value, $meta_keys_mapping[$key], true, $language);
    		if (!$single) {
    			$value = [$value];
    	return $value;

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