[Resolved] Custom 404 Pro plugin settings

Problem:
The client is experiencing an issue where the Custom 404 Pro plugin, even though translated following the rules, links to the Italian error page instead of the English one when switching languages. This causes the settings for the Italian page to be deleted.
Solution:
Since the Custom 404 Pro plugin is not officially compatible with WPML, we recommend adding the following custom code to the

functions.php

file in your theme folder:

add_action('template_redirect', function() {
    global $wpdb;

    // Define the custom table name
    $table_options = $wpdb->prefix . 'custom_404_pro_options';

    // Get the stored 404 page ID from the custom table
    $page_id = $wpdb->get_var("SELECT value FROM $table_options WHERE name = 'mode_page'");

    if (is_404() && $page_id && function_exists('icl_object_id')) {
        $translated_page_id = icl_object_id($page_id, 'page', true);

        if ($translated_page_id && $translated_page_id != $page_id) {
            $translated_page_url = get_permalink($translated_page_id);
            
            if ($translated_page_url) {
                wp_redirect($translated_page_url, 302);
                exit;
            }
        }
    }
});

Please test this code in a staging environment before applying it to your live site. Additionally, consider contacting the plugin authors to encourage them to join our Go Global Program.

If this solution does not resolve your issue or seems outdated, please check our related known issues, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. If necessary, do not hesitate to open a new support ticket.