Fatal error: Uncaught mysqli_sql_exception: Duplicate entry 'sssss' for key 'user' in /var/www/html/web/MI/Perepech/php/task_4/index.php:7 Stack trace: #0 /var/www/html/web/MI/Perepech/php/task_4/index.php(7): mysqli->query() #1 {main} thrown in /var/www/html/web/MI/Perepech/php/task_4/index.php on line 7