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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/course/u53/public_html/submissions/submission06/scripts/login_user.php:15 Stack trace: #0 /home/course/u53/public_html/submissions/submission06/scripts/login_user.php(15): mysqli_query() #1 {main} thrown in /home/course/u53/public_html/submissions/submission06/scripts/login_user.php on line 15