Error System.Web.HttpException when doing a Response.Redirect

I have an action filter that validates me if there is a data or this is true or false to then redirect to an external url. Redirection works well. But I have the filter in my controller globally and when I enter the controller for GET it throws an exception for the @Html.AntiForgeryToken() that is in a partial view that I call on my page that I'm entering by GET.

My filter class:

public class LogActionFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        bool isBloqueado = true;
        if (isBloqueado)
        {
            filterContext.HttpContext.Response.Redirect("https://www.detacoop.cl", true);
            filterContext.HttpContext.ApplicationInstance.CompleteRequest();

            return;
        }

        base.OnActionExecuting(filterContext);
    }
}

My Form that is in a partial view, example: _Footer which is a dependency of my view that I want to render, for example: MyVistaController

@using (Html.BeginForm("LogOff", "Users", FormMethod.Post, new { id = "logoutForm" }))
    {
        @Html.AntiForgeryToken()
        <a href="javascript:document.getElementById('logoutForm').submit()" class="waves-effect waves-light btn-flat u-mar-RL-1 right">Cerrar sesión</a>
    }

And throw me the exception here @Html.AntiForgeryToken()

  

System.Web.HttpException: 'The server can not append a header after sending the HTTP headers.'

Who can help me see why this happens?