Errors in debug.log on site

I’m seeing these recurring errors in my debug.log file:

[03-Jun-2019 17:15:43 UTC] PHP Warning: Invalid argument supplied for foreach() in /var/web/site/public_html/wp-cron.php on line 111

[03-Jun-2019 17:10:22 UTC] PHP Notice: Trying to get property ‘post_type’ of non-object in /var/web/site/public_html/wp-includes/class-wp-query.php on line 4094