Session is always empty

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Hi. I am using this Slim\Extras\Middleware\CsrfGuard.php But I always get this error. Invalid or missing CSRF token.

if (! isset($_SESSION[$this->key])) {
      $_SESSION[$this->key] = sha1(serialize($_SERVER) . rand(0, 0xffffffff));
}
$token = $_SESSION[$this->key];
$userToken = $this->app->request()->post($this->key);
if (isset($userToken) && $token !== $userToken) {
        $this->app->halt(400, 'Invalid or missing CSRF token.');
}

I have checked slim csrf_token so I can get successfully but I always go into in this condition. if (! isset($_SESSION[$this->key])) Session is always empty I think. How can I fix this? I will appreciate any other's help.

[top-challenger]

Hi @silentworks Could you please help me with this issue?