Error

PHP Noticeyii\base\ErrorException

Trying to get property of non-object

$_GET = [
    'r' => 'site/page',
    'id' => '148',
    'nid' => '1399',
    '_lang' => 'zh-TW',
];

$_SESSION = [
    '__flash' => [],
    'lang' => 'zh-TW',
];