Ошибка PHP Notice: Trying to get property

Добрый день. Получаю в лог файл такие ошибки:

12-Mar-2020 17:07:30 UTC] PHP Notice:  Trying to get property 'ID' of non-object in /var/www/vhosts/website.com/httpdocs/wp-content/themes/Avada-Child-Theme/functions.php on line 403
[12-Mar-2020 17:07:30 UTC] PHP Notice:  Trying to get property 'ID' of non-object in /var/www/vhosts/website.com/httpdocs/wp-content/themes/Avada-Child-Theme/functions.php on line 404
[12-Mar-2020 17:07:30 UTC] PHP Notice:  Trying to get property 'ID' of non-object in /var/www/vhosts/website.com/httpdocs/wp-content/themes/Avada-Child-Theme/functions.php on line 405
[12-Mar-2020 17:07:30 UTC] PHP Notice:  Trying to get property 'ID' of non-object in /var/www/vhosts/website.com/httpdocs/wp-content/themes/Avada-Child-Theme/functions.php on line 406

Вот эти строчки:

 $meta_title             = get_post_meta($post->ID, 'humsayaa_custom_seo_title', true);                  // true to return a string
    $meta_description       = get_post_meta($post->ID, 'humsayaa_custom_seo_description', true);            // true to return a string
    $meta_keywords          = get_post_meta($post->ID, 'humsayaa_custom_seo_keywords', true);               // true to return a string
    $meta_robots            = get_post_meta($post->ID, 'humsayaa_custom_seo_robots', false);                // false to return an array

Подскажите, пожалуйста, в чем может быть проблема? Спасибо.

• Тема изменена 4 года, 1 месяц назад пользователем TimEv.