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Fatal error: Uncaught TypeError: mysqli_real_escape_string(): Argument #1 ($mysql) must be of type mysqli, null given in /home/cp420134/public_html/purchasing_list.php:9 Stack trace: #0 /home/cp420134/public_html/purchasing_list.php(9): mysqli_real_escape_string() #1 {main} thrown in /home/cp420134/public_html/purchasing_list.php on line 9