"ble_uart" : Unhandled promise rejection

used code:

bleSendJS = function(_id, _cmd) {
    console.log('s');
    NRF.requestDevice({timeout: 5E3, filters: [{ id: _id }] }).then(function(device) {
        console.log('f');
        console.log(device);
        return require("ble_uart").connect(device);
    }).then(function(uart) {
        console.log('c');
        var data;
        uart.on('data', function(d) {
            data += d;
        });
        uart.write(`\x03\x10(${_cmd})\n`).then(f­unction() {
            setTimeout(function() {
                uart.disconnect();
                console.log('output:',data);
                console.log("Disconnected");
            }, 2000);
        });
    }).catch(function(e) {
        console.log("ERROR:", e);
    });
};

output

>bleSendJS(id, nl1);
=undefined
BluetoothDevice: {
  "id": "d5:c7:e2:67:ac:f0 random",
  "rssi": -81,
  "data": new Uint8Array([2, 1, 6, 12, 9, 73, 79, 50, 52, 52, 55, 32, 97, 99, 102, 48]).buffer
 }
ERROR: Disconnected
Uncaught Error: Unhandled promise rejection: Error: Unhandled promise rejection: InternalError: BLE task completed that wasn't scheduled (4/0)
>

Is there a way to avoid that?