Rendering an order on payment error

Hi! I'm having some problems on payment error when re-rendering the cart. I get a null value exception in the checkout handler when using:

string message = GeneralFunctions.AddTransaction(order, customer, int.Parse(EstoreID), Secret, int.Parse(campaignId), Url);
int transactionNumber = -1;
if (!int.TryParse(message, out transactionNumber))
{
    var formErrorTemplate = new Template("eCom7/CartV2/Step/ShowCart.html");
    formErrorTemplate.SetTag("Softgear:Klarna:Error", message);
    var orderRenderer = new Dynamicweb.eCommerce.Frontend.Renderer();
    orderRenderer.RenderOrder(order, formErrorTemplate); //<-- Exception
    return formErrorTemplate.Output();
}

I have traced it down to us listing related products in the cart, if I remove all related products everything is ok.

We have something similar to this in the cart:

<!--@LoopStart(OrderLines)-->
<!--@LoopStart(ProductRelatedGroups)-->
<!--@LoopStart(Products)-->

<span class="col1"><img src="/admin/public/getimage.aspx?Image=<!--@Ecom:Product.ImageSmall.Default.Clean-->&Format=jpg&Width=40&Height=40&Crop=5" alt="image description" /></span>
<span class="col2"><strong><!--@Ecom:Product.Name--></strong></span>
<span class="col3"><strong><!--@Ecom:Product.Price.Price-->&nbsp;<span><!--@Translate(kr, "kr", Global)--></span></strong></span>

<!--@LoopEnd(Products)-->
<!--@LoopEnd(ProductRelatedGroups)-->        
<!--@LoopEnd(OrderLines)-->

The exception:

at Dynamicweb.eCommerce.Frontend.Renderer.RenderProductRelatedGroups(Product product, Template parentTemplate, String loopName)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template, Int32 loopCounter, Boolean renderRelated, String productURL)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template, Int32 loopCounter, Boolean renderRelated)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template, Int32 loopCounter)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderOrderLine(OrderLine OrderLine, Template Template)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderOrderLines(OrderLineCollection OrderLines, Template ParentTemplate, String LoopName)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderOrderLine(OrderLine OrderLine, Template Template)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderOrderLines(OrderLineCollection OrderLines, Template ParentTemplate, String LoopName)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderOrderDetails(Template template, Order order, Boolean extendedProperties, OrderContext OrderContext)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderOrder(Order Order, Template Template, Boolean ExtendedProperties, Int32 stepReq, OrderContext OrderContext)
at Dynamicweb.eCommerce.Frontend.Renderer.RenderOrder(Order Order, Template Template)

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Rendering an order on payment error

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