Run react-native info in your project and share the content.
What react-native-track-player version are you using?
Production app tracking crashes like this, but I can't simulation. because It's occurs somethimes at some users.
My firebase crash like this for 5% of my user.

Show us the code you are using
My solution is add service in index.js file
import { AppRegistry } from 'react-native';
import TrackPlayer from 'react-native-track-player';
import App from './App';
AppRegistry.registerComponent('example', () => App);
TrackPlayer.registerPlaybackService(() => require('./service'));
and file service you could find in example project
@Saehanseul can you send the part of the code where you register the service?
@Guichaguri I'm using mobx and made trackplayerStore. So using Trackplayer.registerPlaybackService in constructor of trackplayerStore.
like this.

You have to make sure you're registering it in the initialization file, you can't depend on any component to be mounted. We highly recommend registering it right after registering the main component for your app, so no component has to be loaded in order to register the playback service.
Thanks. I'll try it and check the firebase user bug after that:)
Most helpful comment
My solution is add service in
index.jsfileand file
serviceyou could find in example project