GET http://myproject.com/insertData?product_id=1&amount=100&item=shoes 500 (Internal Server Error) [closed]

this is error :- GET http://myproject.com/insertData?amount=100&item=shoes 500 (Internal Server Error)

this is a javascript code :-

          <script type="text/javascript">
            document.addEventListener('DOMContentLoaded', function() {
                var form = document.getElementById('paypal_form');
                form.addEventListener('submit', function() {
                   
                    setData(document.getElementById('amount').value, document.getElementById('item').value);
                   
                });

                function setData(amount, item) {
                    
                    var xhttp = new XMLHttpRequest();
                    xhttp.onreadystatechange = function() { 
                    };
                    xhttp.open("GET", "/insertData? 
                    amount="+amount+"&item="+item, true);
                    xhttp.send();
                }
            });
          </script>

this is a insertdata code :-

          <?php 
          session_start();
         // Include database connection file 
          include_once 'dbConnect.phtml';

         $amount = $_GET['amount'];
         $item = $_GET['item'];
         $status = "pending";

         $insert = $db->query("INSERT INTO product(product_name, 
         price, status1) 
         VALUES('".$item."','".$amount."','".$status."')");

         if (!$insert) {
          die("Error: " . $db->error);
         }

         $last_id = $db->insert_id;

         $_SESSION['product_id'] = $last_id;

I am using laminas framework for develop app with PayPal. but its not save data to databases come this error. I need to fix this.

     'insertData' => [
                'type'    => Literal::class,
                'options' => [
                    'route'    => '/insertData',
                    'defaults' => [
                        'controller' => 
       ControllerViewController::class,
                        'action'     => 'insertData',
                    ],
                ],
            ],

this is a route in module.config.php