Almond crashes whenever the Bluetooth Service is destroyed

[MateusRodCosta]

Basically, I just leave the Almond app on the background for half minute or more and then it crashes. It seems to be realted to the Bluetooth Service.

Part of the logcat follows:

2019-10-08 20:36:08.823 25771-25780/edu.stanford.thingengine.engine W/System: A resource failed to call close. 
2019-10-08 20:37:14.243 25771-25771/edu.stanford.thingengine.engine I/thingengine.Service: Destroying service
2019-10-08 20:37:14.244 25771-25771/edu.stanford.thingengine.engine I/thingengine.Service: Destroyed service
2019-10-08 20:37:14.251 25771-25771/edu.stanford.thingengine.engine E/ActivityThread: Service edu.stanford.thingengine.engine.service.EngineService has leaked IntentReceiver edu.stanford.thingengine.engine.jsapi.BluetoothAPI$Receiver@4d7252a that was originally registered here. Are you missing a call to unregisterReceiver()?
    android.app.IntentReceiverLeaked: Service edu.stanford.thingengine.engine.service.EngineService has leaked IntentReceiver edu.stanford.thingengine.engine.jsapi.BluetoothAPI$Receiver@4d7252a that was originally registered here. Are you missing a call to unregisterReceiver()?
        at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:1438)
        at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:1219)
        at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1491)
        at android.app.ContextImpl.registerReceiver(ContextImpl.java:1452)
        at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:636)
        at edu.stanford.thingengine.engine.jsapi.BluetoothAPI.start(BluetoothAPI.java:149)
        at edu.stanford.thingengine.engine.jsapi.BluetoothAPI.access$500(BluetoothAPI.java:39)
        at edu.stanford.thingengine.engine.jsapi.BluetoothAPI$1.run(BluetoothAPI.java:93)
        at edu.stanford.thingengine.engine.jsapi.JavascriptAPI$1.invoke(JavascriptAPI.java:42)
        at edu.stanford.thingengine.nodejs.NodeJSLauncher$1.run(NodeJSLauncher.java:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
2019-10-08 20:37:14.252 25771-25801/edu.stanford.thingengine.engine E/nodejs: Lost exception TypeError: No such callback stop

This is with commit 228ea15 on a Moto G7 running Android 9