Attempt to invoke virtual method 'void java.util.Timer.cancel()' on a null object reference

[azanli]

NetworkManager.js

    @ReactMethod
    public void stopAdvertising() {
        if(this.type == User.PeerType.ADVERTISER_BROWSER) {
            this.type = User.PeerType.BROWSER;
            this.networkCommunicator.initTransport("WIFI-BT", this.type);
            return;
        }
        this.type = User.PeerType.OFFLINE;
        this.networkCommunicator.stopTransport();
    }

NetworkCommunicator.java

    @Override
    public void stopTransport() {
        broadcastTimer.cancel();
        broadcastTimer = null;
        isRunning = false;
    }

App is crashing upon calling stopAdvertising() with the above error but I'm certain that both "Advertise" and "Browse" are currently on when it's called. It happens after some time has passed while Advertising and Browsing. Would there maybe be a way to check first whether broadcastTimer is currently in progress before invoking cancel() on it within NetworkCommunicator.java?

[azanli]

It seems that the problem has stopped since I've started using the check that I mentioned in the PR. Will report back here if it occurs again.