Fatal error: Uncaught mysqli_sql_exception: Invalid utf8mb3 character string: '\xDA\x1Fj\x12\x97\xB7\xB8\xA4\x84\xF2$f]3\xB1\x19\x0D>\x09\x87\x' 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