Error

PHP Noticeyii\base\ErrorException

Trying to get property of non-object

$_GET = [
    'title' => '%E5%BA%94%E7%94%A8%E7%BB%BC%E8%BF%B0',
    'type' => 'academic',
    'number' => '1',
    'second' => '2',
];

$_SESSION = [
    '__flash' => [],
];