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An error occured while attaching module (Dynamicweb.Frontend.Content)

System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Co3.PLindberg.Dw.DAL.Repositories.ProductRepository.GetProductStockByProductId(String productNumber, String command) in C:\Data\Development\git\plindberg-solution\Co3.PLindberg.Dynamicweb\DAL\Repositories\ProductRepository.cs:line 98
   at Co3.PLindberg.Dw.Services.ProductService.GetStockDetailsByProduct(Product product, String command) in C:\Data\Development\git\plindberg-solution\Co3.PLindberg.Dynamicweb\Services\ProductService.cs:line 65
   at Co3.PLindberg.Dw.Extenders.Products.ProductExtender.ExtendTemplate(Template template, ProductTemplateExtender extender, CacheEngine cacheEngine) in C:\Data\Development\git\plindberg-solution\Co3.PLindberg.Dynamicweb\Extenders\Products\ProductExtender.cs:line 400
   at Co3.Espresso.Dw8.Extenders.ProductExtender.ExtendTemplate(Template template) in C:\Data\Development\git\espresso-solution\Co3.Espresso.Dynamicweb8\Extenders\ProductExtender.cs:line 144
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProductTemplateExtenders(Product Product, Template Template, Boolean ExtendedProperties)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template, Int32 loopCounter, Boolean renderRelated, String productURL, Int32 quantity, Int32 wishListID, Boolean renderPublicList, Int32 orderLineOfProductCount)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProducts(ProductCollection Products, Template ParentTemplate, String LoopName, Int32 LoopCounter, Boolean renderRelatedProducts, Boolean renderRelatedLists)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProducts(ProductCollection Products, Template ParentTemplate)
   at Dynamicweb.eCommerce.Frontend.Renderer.internalRenderProducts(ProductCollection products, Boolean isProductsFromIndex)
   at Dynamicweb.eCommerce.Frontend.Frontend.ListProducts(ProductCollection products, String groupsIdent, Boolean hasBeenSorted)
   at Dynamicweb.eCommerce.Frontend.Frontend.List(String groups)
   at Dynamicweb.eCommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.eCommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)