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

System.NullReferenceException: Object reference not set to an instance of an object.
   at Dynamicweb.eCommerce.Products.ProductGroupRelation.GetCachedProductGroupRelations(String productId)
   at Dynamicweb.eCommerce.Products.ProductGroupRelation.GetCachedProductGroupRelations(Product product)
   at Dynamicweb.eCommerce.Frontend.Renderer.IsProductInRightShopContext(Product product)
   at Dynamicweb.eCommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.eCommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)
ProductsHere
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