Also, there are error logs on Woocommerce logs, please check the screenshot:
https://prntscr.com/rmvpkz
Details as below:
2020-03-26T01:20:05+00:00 CRITICAL Uncaught Error: Call to a member function get_author_permastruct() on null in /var/www/backpackartisan.com/htdocs/wp-includes/author-template.php:346
Stack trace:
#0 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-purger.php(322): get_author_posts_url(‘3’)
#1 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-purger.php(193): Purger->_purge_by_options(108130, ‘1’, ‘1’, ‘1’, ‘1’)
#2 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-nginx-helper-admin.php(589): Purger->purge_post(108130)
#3 /var/www/backpackartisan.com/htdocs/wp-includes/class-wp-hook.php(288): Nginx_Helper_Admin->set_future_post_option_on_future_status(‘publish’, ‘new’, Object(WP_Post))
#4 /var/www/backpackartisan.com/htdocs/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array)
#5 /var/www/backpackartisan.com/htdocs/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#6 /var/www/backpackartisan.com/htdocs/wp-includes/post.php(4620): in /var/www/backpackartisan.com/htdocs/wp-includes/author-template.php on line 346
2020-03-26T01:20:26+00:00 CRITICAL Uncaught Error: Call to a member function get_author_permastruct() on null in /var/www/backpackartisan.com/htdocs/wp-includes/author-template.php:346
Stack trace:
#0 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-purger.php(322): get_author_posts_url(‘3’)
#1 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-purger.php(193): Purger->_purge_by_options(108132, ‘1’, ‘1’, ‘1’, ‘1’)
#2 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-nginx-helper-admin.php(589): Purger->purge_post(108132)
#3 /var/www/backpackartisan.com/htdocs/wp-includes/class-wp-hook.php(288): Nginx_Helper_Admin->set_future_post_option_on_future_status(‘publish’, ‘new’, Object(WP_Post))
#4 /var/www/backpackartisan.com/htdocs/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array)
#5 /var/www/backpackartisan.com/htdocs/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#6 /var/www/backpackartisan.com/htdocs/wp-includes/post.php(4620): in /var/www/backpackartisan.com/htdocs/wp-includes/author-template.php on line 346
2020-03-26T01:20:40+00:00 CRITICAL Uncaught Error: Call to a member function get_author_permastruct() on null in /var/www/backpackartisan.com/htdocs/wp-includes/author-template.php:346
Stack trace:
#0 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-purger.php(322): get_author_posts_url(‘3’)
#1 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-purger.php(193): Purger->_purge_by_options(108133, ‘1’, ‘1’, ‘1’, ‘1’)
#2 /var/www/backpackartisan.com/htdocs/wp-content/plugins/nginx-helper/admin/class-nginx-helper-admin.php(589): Purger->purge_post(108133)
#3 /var/www/backpackartisan.com/htdocs/wp-includes/class-wp-hook.php(288): Nginx_Helper_Admin->set_future_post_option_on_future_status(‘publish’, ‘new’, Object(WP_Post))
#4 /var/www/backpackartisan.com/htdocs/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array)
#5 /var/www/backpackartisan.com/htdocs/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#6 /var/www/backpackartisan.com/htdocs/wp-includes/post.php(4620): in /var/www/backpackartisan.com/htdocs/wp-includes/author-template.php on line 346