Post-relationship

Problem: I am testing the WPML-WC webshop in localhostm with debug: TRUE, and I see error messages in the WMPL box.

One of them: Notice: Trying to get property 'term_id' of non-object in ... sitepress-multilingual-cms/menu/post-menus/post-edit-screen/wpml-meta-boxes-post-edit-html.class.php on line 155

Solution: The cause of the issue is that the Translation Priority taxonomy terms were deleted. To solve this issue I kindly ask you to follow this steps:
- Edit a page -> Right below the error message there is a link 'edit items' -> Click there and add two or three taxonomy terms -> Re-load the page edition -> Save the page.

Relevant Documentation:

Problem:
Unable to use wp_update_term to propely update translated terms. Encountered the error, "The slug already exists"

Solution:
To fix this we need to find the term language and then switch to correct language then update.
Consider using this example:-

add_action('wp', function (){
    $term_id = 4;
    $taxonomy = 'subject';
    $current_lang = apply_filters( 'wpml_current_language', NULL );
    
    $term_language_code = apply_filters( 'wpml_element_language_code', null, ['element_id' => $term_id, 'element_type' => $taxonomy] );
    do_action( 'wpml_switch_language', $term_language_code );
    
    $updated = wp_update_term( $term_id, $taxonomy, array('name'=> 'hello' . time()) );
   
    do_action( 'wpml_switch_language', $current_lang );
    
    if ( ! is_wp_error( $updated ) ) { 
	    var_dump($updated); 
    } else {
	    echo $updated->get_error_message(); 
    }
});