[Spark dev-master] Users on a free plan not reflected in the database

For reference I'm using Laravel Spark dev-master 26eca8d.

I have 4 subscription plans with 3 paid for and 1 free:

From SparkServiceProvider.php

    Spark::plan('Bronze', '1')->price(15)
            ->trialDays(7)
            ->currencySymbol('£')
            ->features([
                //
            ]);

        Spark::plan('Silver', '2')->price(20)
            ->trialDays(7)
            ->currencySymbol('£')
            ->features([
               //
            ]);

        Spark::plan('Gold', '3')->price(25)
            ->trialDays(7)
            ->currencySymbol('£')
            ->features([
               //
            ]);

        // Use Yearly as an override for 'Organisations'
        Spark::free('Organisation')
            ->currencySymbol('£')
            ->yearly()
            ->features([
               //
            ]);

I've setup the paid for ones in Stripe and when I register and select those plans I see the strip_id column in the users table get updated.

However, when I select the 'Free' plan, I see nothing in the database. No records to reflect they've signed up to a free plan.

Wondering if others have had this issue?