Fatal error: Uncaught Error: Call to undefined function wp_kses() in /var/www/html/wp-includes/functions.php:6154
Stack trace:
#0 /var/www/html/wp-includes/functions.php(6084): wp_trigger_error('', 'Function custom...')
#1 /var/www/html/wp-includes/class-wpdb.php(1283): _doing_it_wrong('customDB', 'Function custom...', '(This message w...')
#2 /var/www/html/wp-includes/class-wpdb.php(1307): wpdb->_real_escape('yes')
#3 /var/www/html/wp-includes/formatting.php(4458): wpdb->_escape(Array)
#4 /var/www/html/wp-includes/option.php(625): esc_sql(Array)
#5 /var/www/html/wp-includes/functions.php(1787): wp_load_alloptions()
#6 /var/www/html/wp-includes/load.php(943): is_blog_installed()
#7 /var/www/html/wp-settings.php(180): wp_not_installed()
#8 /var/www/html/wp-config.php(21): require_once('/var/www/html/w...')
#9 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#10 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#11 /var/www/html/index.php(17): require('/var/www/html/w...')
#12 {main}
  thrown in /var/www/html/wp-includes/functions.php on line 6154