How to use groups.getById in appWidgets.update VK API?

Question

API

I'm trying to update a widget using the appWidgets.update method. If I don't use the line in the code parameter:
var group = API.groups.getById({ group_id: "apiclub"})[0];
then the widget is displayed, if I use it, then the appWidgets.update method returns 1, i.e. everything is fine, but the widget itself is not displayed.
For info: the first line is
var user = API.users.get({ id: Args.uid })[0];
those. the syntax is ok. I tried to execute the code on the page https://vk.com/dev/execute , everything is fine too.
Has anyone used groups.getById in widget code? Please share what works.