System.NullReferenceException on direct navigation to page - asp.net-mvc

Question

Hi I have a problem when I try to access a page in my application directly. When I navigate within the application to the page, does everything work.
<input type="button"
class="btn btn-primary"
id="calulate"
value="Finanzierungsrate berechnen"
onclick="location.href ='#Url.Action("calculate", "RatesKit", new { id = "bc338d8d-58b9-4867-9730-6b92a516a496"}) '" />
Here the controller method:
[HttpGet]
public ActionResult calculate(string id, string objectDescription, string objectPrice)
{
if (string.IsNullOrEmpty(id))
{
return RedirectToAction("NotValid");
}
else
{
if (Validator.ValidateToken(id, out bob))
{
OfferRequest request = Session["RequestOffer"] as OfferRequest;
if (request != null)
{
ViewData["Dealer"] = bob;
//..
}
}
else
{
return RedirectToAction("NotValid");
}
return View();
}
}
when I reload the page with F5, the page loaded without Problems. But if I try to access the site directly (Just hit enter in the address bar of Browser), I get the following error message:
Definitely, theres is no mistake at this point! If I remove the Razor Syntax #DateTime.Now.Year the fault is located at a different point with Razor syntax.
I do not know, why there is an error only with direct access.
Similar problems I've already looked at, unfortunately without solution to my problem.
System.NullReference Exception occurred in App_Web_XXX.dll - Error in Partial View
System.NullReferenceException in App_Web_*.dll
Thanks for any advice
Her the full page:
#{
ViewBag.Title = "Finanzierungsrate berechnen";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<meta charset="utf-8" />
<div align="center">
<h2>Finanzierungsrate berechnen</h2>
<div style="max-width:700px;">
<div id="ratesView">
#{Html.RenderPartial("ViewCalculateRate", ViewData);}
</div>
</div>
</div>
<table>
<tr>
<td valign="top" class="footerContent" style="padding-top: 20px;color: #878780; font-size: 11px; text-align: left;">
© #DateTime.Now.Year XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Alle Rechte vorbehalten. Impressum
</td>
</tr>
<tr valign="top" class="footerContent" style="padding-top: 20px; color: #878780; font-size: 11px; text-align: left;">
<td>Wir übernehmen keine Gewähr für die Richtigkeit dieser Berechnung.</td>
</tr>
</table>
<div id="backbutton" style="padding:20px 0; display:inline-block;">
<input type="button"
class="btn btn-primary btn-xs"
id="backButton"
value="Zurück"
onclick="location.href ='#Request.UrlReferrer.AbsoluteUri'" />
</div>

Answer 1

I got it....
<div id="backbutton" style="padding:20px 0; display:inline-block;">
<input type="button"
class="btn btn-primary btn-xs"
id="backButton"
value="Zurück"
onclick="location.href ='#Request.UrlReferrer.AbsoluteUri'" />
</div>
Request does not exist when I go directly to the page. So I was unable to create the button ...
THX Sometimes you have to look at the code times from the outside.