Error logging in with new Gmail account

[mrprowse]

Logging in with my ages-old Gmail account worked fine. When I tried to login with a newly-created Gmail email address, I got the following error:

Notice (8): Undefined index: oid [APP/Controller/AppUsersController.php, line 107]
Code Context
$this->SocialProfile->recursive = -1;
$existingProfile = $this->SocialProfile->find('first', array(
'conditions' => array('oid' => $incomingProfile['oid'])
$incomingProfile = array(
'given_name' => 'Josh',
'family_name' => 'Prowse',
'picture' => 'https://lh3.googleusercontent.com/-XdUIqdMkCWA/AAAAAAAAAAI/AAAAAAAAAAA/4252rscbv5M/photo.jpg',
'locale' => 'en',
'username' => 'Josh Prowse',
'raw' => '{
"id": "103780668085339462184",
"name": "Josh Prowse",
"given_name": "Josh",
"family_name": "Prowse",
"picture": "https://lh3.googleusercontent.com/-XdUIqdMkCWA/AAAAAAAAAAI/AAAAAAAAAAA/4252rscbv5M/photo.jpg",
"locale": "en"
}
',
'provider' => 'Google'
)
$accessToken = 'ya29.9AFkPJkBYKt5UFrICM6HkHyuGRn2iaiq0sj-yNneFKWwS5k8qP7Qo9hDuokgYZyyLFiC'
AppUsersController::__successfulExtAuth() - APP/Controller/AppUsersController.php, line 107
AppUsersController::auth_callback() - APP/Controller/AppUsersController.php, line 94
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - APP/Vendor/pear-pear.cakephp.org/CakePHP/Cake/Controller/Controller.php, line 490
Dispatcher::_invoke() - APP/Vendor/pear-pear.cakephp.org/CakePHP/Cake/Routing/Dispatcher.php, line 187
Dispatcher::dispatch() - APP/Vendor/pear-pear.cakephp.org/CakePHP/Cake/Routing/Dispatcher.php, line 162
[main] - APP/webroot/index.php, line 98