How to make edit_order page work

Order Id

Notice: Trying to access array offset on value of type null in /opt/lampp/htdocs/e-shop/admin/edit_order.php on line 58
Order Price

Notice: Trying to access array offset on value of type null in /opt/lampp/htdocs/e-shop/admin/edit_order.php on line 63
Order Status
Notice: Trying to access array offset on value of type null in /opt/lampp/htdocs/e-shop/admin/edit_order.php on line 71 >Not paid>
Order Date

Notice: Trying to access array offset on value of type null in /opt/lampp/htdocs/e-shop/admin/edit_order.php on line 80

prepare("SELECT * FROM orders WHERE order_id=?");
	$stmt->bind_param('i', $order_id);
	$stmt->execute();

	$order_result = $stmt->get_result();
	$order = $order_result->fetch_assoc();

} else if (isset($_POST['edit_order'])) {

	$order_status = $_POST['order_status'];
	$order_id = $_POST['order_id'];

	$stmt = $conn->prepare("UPDATE orders SET order_status=? WHERE order_id=?");
	$stmt->bind_param('si', $order_status, $order_id);

	if ($stmt->execute()) {
		header('Location: index.php?order_updated=Order has been updated successfully');
		exit;
	} else {
		header('Location: products.php?order_failure=Error occurred, please try again');
		exit;
	}
} else {
	header('Location: index.php');
	exit;
}
?>

<div class="container-fluid">
    <div class="row" style="min-height: 200px">       

        
            <div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
                <h1 class="h2">Dashboard</h1>
                <div class="btn-toolbar mb-2 mb-md-0">
                    <div class="btn-group me-2"></div>
                </div>
            </div>

            <h2>Edit Order</h2>
            <div class="table-responsive">

                <div class="mx-auto container">                   

                        <p style="color: rgba(255, 0, 0, 1)"></p>

                        <div class="form-group mt-2">
                            Order Id
                            <p class="my-4"></p>
                        </div>

                        <div class="form-group my-3">
                            Order Price
                            <p class="my-4"></p>
                        </div>                       

                        <div class="form-group my-3">
                            Order Status
                            
                                Not paid>
                                Paid>
                                Shipped>
                                Delivered>                            
                        </div>

                        <div class="form-group my-3">
                            Order Date
                            <p class="my-4"></p>
                        </div>
                        <div class="form-group mt-3">                            
                        </div>                    
                </div>
            </div>
        
    </div>
</div>