Error when using Puck.eval in Web Bluetooth

I have Puck.write working fine but Puck.eval is throwing an error on Chrome on Ubuntu.

Same error no matter what command I try, even 1+1.

<button onclick="Puck.eval('1+1;',function(x) { console.log(x); })">Get The Time</button>

This is on 1v92.

Am I missing something obvious? Thanks!

Uncaught SyntaxError: Unexpected token U in JSON at position 0
    at JSON.parse (<anonymous>)
    at puck.js:298
    at Object.connection.cb (puck.js:235)
    at Object.ondata (puck.js:272)
    at Object.emit (puck.js:100)
    at BluetoothRemoteGATTCharacteristic.<anony­mous> (puck.js:190)