Notice: Trying to get property ‘post_title’ of non-object

WordPress 5.4 and 5.3.2
wp-config.php: When I set define( 'WP_DEBUG', true );
I received messages only on HOMEPAGE:

Notice: Trying to get property ‘ID’ of non-object in /home/…/wp-includes/class-wp-query.php on line 3998

Notice: Trying to get property ‘post_title’ of non-object in /home/…/wp-includes/class-wp-query.php on line 4000

Notice: Trying to get property ‘post_name’ of non-object in /home/…/wp-includes/class-wp-query.php on line 4002