Fatal error: Uncaught mysqli_sql_exception: Invalid utf8mb3 character string: 'J\xFB\xB6\xE7\xE8Hl\xCB\xEB' in /var/www/html/public_html/class/classDb.php:503
Stack trace:
#0 /var/www/html/public_html/class/classDb.php(503): mysqli->query()
#1 /var/www/html/public_html/class/classDb.php(554): Database->execute()
#2 /var/www/html/public_html/download-certificate.php(45): Database->fetch_first()
#3 {main}
thrown in /var/www/html/public_html/class/classDb.php on line 503