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TypeError

Argument 1 passed to app\models\extensions\TopicExtension::getList() must be of the type string, null given, called in /usr/share/nginx/html/course/models/extensions/TopicExtension.php on line 197

$_GET = [
    'id' => 'NzllZjA1MjFmYzBkNTUyZTM3MTI=',
];

$_SESSION = [
    '__flash' => [],
    'hd_token' => '47c95fcecdc5fe4015c30e8239365259',
];