I'm getting an error "object reference not set to an instance of an object"

@model IEnumerable<WebApp.Models.Produkt>

<h1>a List</h1>

@if (Model == null || !Model.Any())
{
    <p>No products available.</p>
}
else
{
    @foreach (var product in Model)
    {
        if (product != null)
        {
            <li>
                <b>@product.name</b> - @product.category
                <a href="@Url.Action("Details", "Warehouse", new { id = product.id })">Details</a>
                <button>Delete</button>
            </li>
        }
    }
}