Notice: Undefined index: code in /home/concorso/api.liszt2011.com/index.php on line 96

Fatal error: Uncaught TypeError: Argument 1 passed to chillerlan\QRCode\QRCode::addByteSegment() must be of the type string, null given, called in /home/concorso/api.liszt2011.com/index.php on line 96 and defined in /home/concorso/api.liszt2011.com/vendor/chillerlan/php-qrcode/src/QRCode.php:421 Stack trace: #0 /home/concorso/api.liszt2011.com/index.php(96): chillerlan\QRCode\QRCode->addByteSegment(NULL) #1 {main} thrown in /home/concorso/api.liszt2011.com/vendor/chillerlan/php-qrcode/src/QRCode.php on line 421