Fatal error: Uncaught Error: Call to a member function flush_rules() on null in /home/customer/www/greatplacetowork.com.ph/public_html/wp-content/plugins/headers-security-advanced-hsts-wp/headers-security-advanced-hsts-wp.php:516 Stack trace: #0 /home/customer/www/greatplacetowork.com.ph/public_html/wp-content/plugins/headers-security-advanced-hsts-wp/headers-security-advanced-hsts-wp.php(511): hsts_plugin_flush_rewrite_rules() #1 /home/customer/www/greatplacetowork.com.ph/public_html/wp-content/plugins/headers-security-advanced-hsts-wp/headers-security-advanced-hsts-wp.php(441): hsts_plugin_cleanup_htaccess() #2 /home/customer/www/greatplacetowork.com.ph/public_html/wp-includes/class-wp-hook.php(326): hsts_plugin_update_htaccess(Object(Plugin_Upgrader)) #3 /home/customer/www/greatplacetowork.com.ph/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #4 /home/customer/www/greatplacetowork.com.ph/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #5 /home/customer/www/greatpl in /home/customer/www/greatplacetowork.com.ph/public_html/wp-content/plugins/headers-security-advanced-hsts-wp/headers-security-advanced-hsts-wp.php on line 516