diff --git a/pkg/invoices.go b/pkg/invoices.go
index a23e445..358028c 100644
--- a/pkg/invoices.go
+++ b/pkg/invoices.go
@@ -958,7 +958,7 @@ func (form *invoiceForm) MustFillFromQuote(ctx context.Context, conn *Conn, slug
 		return false
 	}
 	form.Products = []*invoiceProductForm{}
-	form.mustAddProductsFromQuery(ctx, conn, "select '', coalesce(product_id, 0), name, description, to_price(price, $2), quantity, (discount_rate * 100)::integer, array_remove(array_agg(tax_id), null) from quote_product left join quote_product_product using (quote_product_id) left join quote_product_tax using (quote_product_id) where quote_id = $1 group by quote_product_id, coalesce(product_id, 0), name, description, discount_rate, price, quantity", quoteId, form.company.DecimalDigits)
+	form.mustAddProductsFromQuery(ctx, conn, "select '', coalesce(product_id::text, ''), name, description, to_price(price, $2), quantity, (discount_rate * 100)::integer, array_remove(array_agg(tax_id), null) from quote_product left join quote_product_product using (quote_product_id) left join quote_product_tax using (quote_product_id) where quote_id = $1 group by quote_product_id, coalesce(product_id::text, ''), name, description, discount_rate, price, quantity", quoteId, form.company.DecimalDigits)
 	return true
 }