Afficher des articles depuis une bdd

bonjour, j'ai récupéré un script pour cart carddy mai je n'arrive pas a affiché les articles, il affiche

Citation:

"Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, null given in D:\Site\PHP\panier\Advance_Shopping_cart-master\index.php on line 71",

voici le code en question

Code:

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<?php
session_start();
 
require_once ('php/CreateDb.php');
require_once ('./php/component.php');
 
 
// create instance of Createdb class
$database = new CreateDb("productdb", "producttb");
 
if (isset($_POST['add'])){
    /// print_r($_POST['product_id']);
    if(isset($_SESSION['cart'])){
 
        $item_array_id = array_column($_SESSION['cart'], "product_id");
 
        if(in_array($_POST['product_id'], $item_array_id)){
            echo "<script>alert('Product is already added in the cart..!')</script>";
            echo "<script>window.location = 'index.php'</script>";
        }else{
 
            $count = count($_SESSION['cart']);
            $item_array = array(
                'product_id' => $_POST['product_id']
            );
 
            $_SESSION['cart'][$count] = $item_array;
        }
 
    }else{
 
        $item_array = array(
                'product_id' => $_POST['product_id']
        );
 
        // Create new session variable
        $_SESSION['cart'][0] = $item_array;
        print_r($_SESSION['cart']);
    }
}
 
 
?>
 
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Shopping Cart</title>
 
    <!-- Font Awesome -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.8.2/css/all.css" />
 
    <!-- Bootstrap CDN -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
 
    <link rel="stylesheet" href="style.css">
</head>
<body>
 
 
<?php require_once ("php/header.php"); ?>
<div class="container">
        <div class="row text-center py-5">
            <?php
                $result = $database->getData();
                while ($row = mysqli_fetch_assoc($result)){  // ligne ou il y a erreur
                    component($row['product_name'], $row['product_price'], $row['product_image'], $row['id']);
                }
            ?>
        </div>
</div>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

merci d'avance pour vos réponse