Fatal error: Uncaught mysqli_sql_exception: Duplicate entry '' for key 'tg' in /var/www/group-telegram/function.php:293
Stack trace:
#0 /var/www/group-telegram/function.php(293): mysqli_query()
#1 /var/www/group-telegram/add.php(90): insert()
#2 {main}
thrown in /var/www/group-telegram/function.php on line 293