Working on stack.

app/Http/Middleware/GuestMiddleware.php

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+<?php namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Contracts\Auth\Authenticator;
+use Illuminate\Contracts\Routing\Middleware;
+
+class GuestMiddleware implements Middleware {
+
+	/**
+	 * The authenticator implementation.
+	 *
+	 * @var Authenticator
+	 */
+	protected $auth;
+
+	/**
+	 * Create a new filter instance.
+	 *
+	 * @param  Authenticator  $auth
+	 * @return void
+	 */
+	public function __construct(Authenticator $auth)
+	{
+		$this->auth = $auth;
+	}
+
+	/**
+	 * Handle an incoming request.
+	 *
+	 * @param  \Symfony\Component\HttpFoundation\Request  $request
+	 * @param  \Closure  $next
+	 * @return \Symfony\Component\HttpFoundation\Response
+	 */
+	public function handle($request, Closure $next)
+	{
+		if ($this->auth->check())
+		{
+			return new RedirectResponse(url('/'));
+		}
+
+		return $next($request);
+	}
+
+}