TypeError Cannot read property 'write' of null

Hello !

I implemented DIscordRPC in my app, and I must say it was very easy to do. Thanks for that :)

Some of our users' seem to run into an error though as Sentry occasionally sends us some alerts about the same kind of error as in this issue's topic.

It occurs on line 152 of src/transports/ipc.js :

  send(data, op = OPCodes.FRAME) {
    this.socket.write(encode(op, data));
  }

So I assume this.socket isn't properly initialized as if connect() didn't get triggered for some reason (or before send() is used, at least.)

Not sure if I can do anything about it so I wanted to open this issue.

Here's the related code we use to connect and send activity through Discord RPC :

let rpc: any;

discordRPC.register(clientId);

export function setDiscordActivity(activityType: 'song' | 'idle', activityData?: any) {
    try {
        if (!getConfig().Online.Discord.DisplayActivity || !rpc) return;
        const startTimestamp = new Date();
        let activity: string;
        let activityDetail = 'Zzz...';
        if (activityType === 'idle') {
            activity = sample(i18next.t('DISCORD.IDLING', {returnObjects: true}));
        }
        if (activityType === 'song') {
            activity = activityData.title,
            activityDetail = activityData.singer;
        }
        rpc.setActivity({
            details: activity.substring(0, 128),
            state: activityDetail.substring(0, 128),
            startTimestamp,
            largeImageKey: 'nanami-smile',
            largeImageText: 'Karaoke Mugen',
            smallImageKey: activityType === 'song' ? 'play' : 'pause',
            smallImageText: `Version ${version.number} - ${version.name}`,
            instance: false,
        });
    } catch(err) {
        sentry.error(err, 'Warning');
        // Non-fatal
    }
}

export function stopDiscordRPC() {
    if (rpc) {
        rpc.clearActivity();
        rpc.destroy();
        rpc = null;
    }
}

export function initDiscordRPC() {
    if (rpc || !getConfig().Online.Discord.DisplayActivity) return;
    rpc = new discordRPC.Client({ transport: 'ipc' });

    rpc.on('ready', () => {
        setDiscordActivity('idle');
        // activity can only be set every 15 seconds
    });
    rpc.login({ clientId }).catch(console.error);

}

Are we doing something wrong that could trigger this error?

Thanks in advance for your help.

discordjs / RPC

TypeError Cannot read property 'write' of null #82