nopSolutions/nopCommerce · warning · ArgumentException

No category found with the specified id

Error message

No category found with the specified id

What it means

Thrown by CategoryController.ProductList (permission: CATEGORIES_VIEW). The product-grid datasource loads the parent category by searchModel.CategoryId and throws ArgumentException if absent. The category was deleted or the id is invalid for the current scope.

Source

Thrown at src/Presentation/Nop.Web/Areas/Admin/Controllers/CategoryController.cs:464

        }
        catch (Exception exc)
        {
            await _notificationService.ErrorNotificationAsync(exc);
            return RedirectToAction("List");
        }
    }

    #endregion

    #region Products

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.CATEGORIES_VIEW)]
    public virtual async Task<IActionResult> ProductList(CategoryProductSearchModel searchModel)
    {
        //try to get a category with the specified id
        var category = await _categoryService.GetCategoryByIdAsync(searchModel.CategoryId)
            ?? throw new ArgumentException("No category found with the specified id");

        //prepare model
        var model = await _categoryModelFactory.PrepareCategoryProductListModelAsync(searchModel, category);

        return Json(model);
    }

    [CheckPermission(StandardPermission.Catalog.CATEGORIES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductUpdate(CategoryProductModel model)
    {
        //try to get a product category with the specified id
        var productCategory = await _categoryService.GetProductCategoryByIdAsync(model.Id)
            ?? throw new ArgumentException("No product category mapping found with the specified id");

        //fill entity from product
        productCategory = model.ToEntity(productCategory);
        await _categoryService.UpdateProductCategoryAsync(productCategory);

View on GitHub (pinned to 64bdf2ff08)

Solutions

  1. Reopen the category from the list so the product grid references a current CategoryId.
  2. Return an empty product list instead of throwing when the parent category is missing.
  3. Audit client-side code that may retain a stale CategoryId across navigation.

Example fix

// before
var category = await _categoryService.GetCategoryByIdAsync(searchModel.CategoryId)
    ?? throw new ArgumentException("No category found with the specified id");

// after
var category = await _categoryService.GetCategoryByIdAsync(searchModel.CategoryId);
if (category == null)
    return Json(new CategoryProductListModel());
Defensive patterns

Strategy: validation

Validate before calling

// Validate category exists before listing its products.
var category = await _categoryService.GetCategoryByIdAsync(searchModel.CategoryId);
if (category == null) return Json(new CategoryProductListModel());

Type guard

static bool CategoryExists(Category c) => c is not null;

Try / catch

try { /* ProductList body */ }
catch (ArgumentException ex) when (ex.Message.Contains("category"))
{
    return Json(new CategoryProductListModel());
}

Prevention

When it happens

Trigger: POST ProductList with a CategoryId that GetCategoryByIdAsync cannot find — parent category removed while its product tab was open, or a stale/tampered id.

Common situations: Concurrent catalog edits; category deleted in another tab; UI caching an old CategoryId after navigation.

Related errors

AI-assisted analysis of nopSolutions/nopCommerce@64bdf2ff08 (2026-08-13). Data as JSON: /api/errors/eb5b0c10371884e9. Report an issue: GitHub.