Fix for broken upgrade button

If you noticed that you weren't able to press the upgrade button, it wasn't just you. We identified a small subset of our users who had been caught in a nasty in-between state. So we asked a couple of our devs to take a look at it and quick as they are they've now deployed a fix 🔧

There's a big chance you didn't even notice there was a bug in the first but rest assured that it's gone nevertheless.