Warning about unmounted component

Question

I have an app that read values from an external devices, then these values are written in a DB. When I wrote this data in the db I receive this error:

Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in the componentWillUnmount method.

And It is about this code:

this.setState(state => ({
          acc_dx,
          array_acc_dx: [...state.array_acc_dx, [timeagm, ...acc_dx].join(":")]
        }));

this code is a part of a function setupNotifications1 which in turn is called in a function called in the componentDidMount ().

How can I solve this warning? Thank you.

EDIT 1:

componentDidMount() {
    this.deviceService1(this.device1);
  }

Inside deviceService1() I call this.deviceService2(this.device2) and inside I call setupNotifications1(this.device1) and setupNotifications2(this.device2)

EDIT 2:

async setupNotifications1(device) {
    var timeagm = 0;
    var time = 0;
    const service = this.serviceGeneral();


    this.subscriptionMonitor1 = await device.monitorCharacteristicForService(
      service,
      this.AccGyrMg,
      (error, characteristic) => {
        if (error) {
          this.error(error.message);
          return;
        }

        const buf = Buffer.from(characteristic.value, "base64");
        const [...acc_dx] = [2, 4, 6].map(index => buf.readInt16LE(index));
        this.setState(state => ({
          acc_dx,
          array_acc_dx: [...state.array_acc_dx, [timeagm, ...acc_dx].join(":")]
        }));
        timeagm += 20;

then I have a stop button that is used to remove this.subscriptionMonitor1 and change page ( I pass the value in the other page where there are written in the DB )