laravel cashier not working with jessengers mongodb

I am trying to use laravel/cashier with jessengers MongoDB. I am using Laravel 5.2 and Jessenger MongoDb Extension

$user->newSubscription($plan_data['name'], $plan_data['id'])->create($stripeToken);

Getting this error:

Fatal error: Call to a member function getDateFormat() on null in /location/to/laravel/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php on line 2990
Call to a member function getDateFormat() on null

I already Tried:

Github Issue #222

Github Issue #904

Github Issue #618

via Chebli Mohamed