Getting error when publish post after recent update

Warning: count(): Parameter must be an array or an object that implements Countable in /wp-includes/post-template.php on line 293

Warning: Cannot modify header information – headers already sent by (output started at /wp-includes/post-template.php:293) in /srv/users/cybersportdev/apps/cybersportprod/public/wp-admin/post.php on line 222

Warning: Cannot modify header information – headers already sent by (output started at /wp-includes/post-template.php:293) in /srv/users/cybersportdev/apps/cybersportprod/public/wp-includes/pluggable.php on line 1251

Warning: Cannot modify header information – headers already sent by (output started at /wp-includes/post-template.php:293) in /srv/users/cybersportdev/apps/cybersportprod/public/wp-includes/pluggable.php on line 1254