how to fix it

[171497767]

tc 10.x

mysql 8.0.3

php 8.0.2

Warning: Undefined array key "username" in D:\xxx\WWW\WoWSimpleRegistration\application\include\user.php on line 127

[leapyear1969]

same happens here:

Warning: Undefined array key "username" in /var/www/legion/application/include/user.php on line 127

it looks like the application/vendor/catfan/medoo/src/Medoo.php in higher version like php 8 cannot have a good deal with mysql