Here’s the error:
TypeError: f.state is not a function
How to reproduce:
1. Using TwentyFifteen (or any theme), activate PageBuilder and the Widgets bundle.
2. Enable the Google maps widget.
3. Add the widget to any widget area, and add a location into the widget.
4. Now go into the Customizer – it won’t fully load, and Firebug spits out the above error.
Let me know if you need more info 🙂