I'm importing a lot of products using the API, and everything seems to show up fine in the tree, but when I click on a product I get this error in the back-office:

[NullReferenceException: Object reference not set to an instance of an object.]
   UCommerce.Presentation.Presenters.Catalog.EditProductPresenter.BindView() +1261
   UCommerce.Presentation.Presenters.Catalog.EditProductPresenter.View_Load(Object sender, EventArgs e) +15
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   umbraco.BasePages.BasePage.OnLoad(EventArgs e) +18
   System.Web.UI.Control.LoadRecursive() +70
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3063

I'm creating products, setting a definition, relating them to a category, giving them a description, adding a custom property and creating a price for them. What am I missing? I'm not getting any errors when creating the products, so...

The code that imports the products are here:

foreach (var variant in product.Variants) {
    newProduct.Name = product.DisplayName;
    newProduct.CreatedBy = newProduct.ModifiedBy = "System";
    newProduct.CreatedOn = newProduct.ModifiedOn = DateTime.UtcNow;
    newProduct.Sku = product.ProductId;
    newProduct.VariantSku = variant.VariantId;
    newProduct.ProductDefinition = statelessSession.CreateCriteria<ProductDefinition>().Add(Restrictions.Eq("Name", "Jewelry")).List<ProductDefinition>().First();
    statelessSession.Insert(newProduct);

    CategoryProductRelation cpr = new CategoryProductRelation();
    cpr.Category = category;
    cpr.Product = newProduct;
    statelessSession.Insert(cpr);

    ProductDescription desc = new ProductDescription();
    desc.CultureCode = culture;
    desc.DisplayName = product.DisplayName;
    desc.ShortDescription = variant.Description;
    desc.Product = newProduct;
    statelessSession.Insert(desc);

    ProductDescriptionProperty color = new ProductDescriptionProperty();
    color.ProductDefinitionField = statelessSession.CreateCriteria<ProductDefinitionField>().Add(Restrictions.Eq("Name", "Color")).List<ProductDefinitionField>().First();
    color.ProductDescription = desc;
    color.Value = variant.Color;
    statelessSession.Insert(color);

    foreach (KeyValuePair<String, ProductPrice> pair in variant.Prices) {
        Currency curr = statelessSession.CreateCriteria<Currency>().Add(Restrictions.Eq("ISOCode", pair.Key)).List<Currency>().First();
        if (curr != null) {
            PriceGroup pg = statelessSession.CreateCriteria<PriceGroup>().Add(Restrictions.Eq("CurrencyId", curr.Id)).List<PriceGroup>().First();
            if (pg != null) {
                PriceGroupPrice pgp = new PriceGroupPrice();
                pgp.PriceGroup = pg;
                pgp.Product = newProduct;
                pgp.Price = pair.Value.Price;
                statelessSession.Insert(pgp);
            }
        }
    }
}