Bluetooth causing my tablet to freeze and eventually crash

I'm trying to make an app that allows me to control the Mindstorms Ev3 with app inventor. The issue is that every time I choose what to connect to using my list picker the app instantly freezes up and crashes.

Here is the code for my connect list picker.

Here is the viewer and components.

Does the Mindstorm EV3 require a Clock Timer to periodically check for input?

I don't see one in your components list.

P.S. there are some nice posts at
from more knowledgeable pople.

I don't have a clock in this code, this is my first time using the Ev3 I don't quite understand why a clock is need. Ill look into that link though.