Unhandled exception System.StackOVerflowException c#

I wrote a piece of code that returns a random string sponsorname from a list of sponsors. This sponsorname should be visible at each page, so I call the RandomSponsor method in the shared _layout view. This RandomSponsor method is based in the HomeController and has it's own view containing only a Html.Action

And at that Html.Action the program returns an error:

System.StackOverflowException {Cannot evaluate expression because the current thread is in a stack overflow state.}

This is my RandomSponsor method:

    [HttpGet]   
[ChildActionOnly]
public ActionResult RandomSponsor()
{
    var model = service.getRandomSponsor();
    return PartialView("RandomSponsor", model);
}

RandomSponsor.cshtml, where the programs stops

@Html.Action("RandomSponsor")

And my call in the shared layout page _Layout.cshtml:

@Html.Action("RandomSponsor", "Home")

While i'm debugging i noticed that the RandomSponsor method goes to it's view, but because my Html.Action requests the function again, it's stuck in a loop. I think I give the wrong parameter to the Html.Action in the RandomSponsor.cshtml view, but I dont know what is the correct one.

Does anyone had a similar problem or knows how to fix this error, i'm all ears.

Regards