Wrong number of segments in token (OAuth Google Api with php)

I have a php application that use OAuth2 to authenticate users to their account.

until yesterday, everything worked very well.

But today, when I try to access to my account, and after I authenticates to my google account, I obtain a blank page.

I debug the code and I found that it crashed when the Google_Client try to verifyIdToken and more exactly in the function verifySignedJwtWithCerts because : $segments = explode(".", $jwt); find 4 segments and not 3.

here is my code :

...
$client = new Google_Client();
$client->setClientId($clientId);
$client->setClientSecret($clientSecret);
$client->setRedirectUri($redirectUri);
$client->setScopes("email");

if(!isset($_GET['code']))
    header("Location: ".$client->createAuthUrl());
else
{
    $client->authenticate($_GET['code']);
    $_SESSION["access_token"] = $client->getAccessToken();


    if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
      $client->setAccessToken($_SESSION['access_token']);
    } else {
      $authUrl = $client->createAuthUrl();
    }

    $ticket = $client->verifyIdToken();
    if ($ticket) {
        $admin = $ticket->getAttributes();

    }
    $_SESSION["email"] = $admin["payload"]["email"];

    ...

Can anyone offer an explanation?
Thank's in advance