TypeError: Cannot read property 'name' of undefined ionic code example

Example: TypeError: Cannot read property 'name' of undefined ionic

var availableDevices = Object.keys(devices).reduce(function (availAcc, deviceCategory) {
    var availableDevicesInCategory = devices[deviceCategory];
    availableDevicesInCategory.forEach(function (device) {
        if (device && device.name === deviceType.name.replace(/\-inch/g, ' inch') && device.isAvailable == true) {
            availAcc.push(device);
        }
    });
    return availAcc;
}, []);