How to make an if else output if there is and is not?

Question

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It is necessary to display if the community is banned, then I display the error "Community banned", if not banned, then we do not display anything.
I do so

$group = json_decode(file_get_contents("https://api.vk.com/method/groups.getById?group_ids={$groupId}&v=5.67"),true);

if($group['response'][0]['deactivated'] == "banned"){
        $error_code = "<br><div class=\"callout callout-danger\"> Сообщество заблокировано!</div>";
        }
        else{
        $error_code = "";
        }

This only shows up on the page if the community is banned, and if not, it can't find it: How do I fix this?
$group['response'][0]['deactivated']

Answer 1

if( isset( $group['response'],$group['response'][0], $group['response'][0]['deactivated'])
  &&
  $group['response'][0]['deactivated'] === "banned"
){ // ...