Laravel Socialize giving undefined access_token

I followed the laracasts tutorial on Socialite with Laravel 5.0 and I ran in to the below error. It occurred after logging in to GitHub and being redirected. I don't know how Socialize works on the back end.

ErrorException in AbstractProvider.php line 257:

Undefined index: access_token in AbstractProvider.php line 257
at HandleExceptions->handleError('8', 'Undefined index: access_token',
'/home/vagrant/blog/vendor/laravel/socialite/src/Two/AbstractProvider.php', 
'257', array('body' => object(Stream))) in AbstractProvider.php line 257
at AbstractProvider->parseAccessToken(object(Stream)) in 
AbstractProvider.php line 232
at AbstractProvider->getAccessToken('d21bd355569b6249cfd3') in 
AbstractProvider.php line 195

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