Error

PHP Noticeyii\base\ErrorException

Trying to get property of non-object

$_GET = [
    'r' => 'forum/info',
    'id' => '12',
];

$_SESSION = [
    '__flash' => [],
    'openid' => '',
    'sessionid' => 'iu8m1046aoh9nhoihk7bqfntd7',
];