Get user location crash in iOS beta4

I used the code below before iOS 10 (e.g. iOS 9.3) to get user location successfully.

    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    [self.locationManager requestWhenInUseAuthorization];
    [self.locationManager startUpdatingLocation];

    CLLocationCoordinate2D noLocation;

    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(noLocation, 20000, 20000);
    MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:viewRegion];
    [self.mapView setRegion:adjustedRegion animated:YES];
    self.mapView.showsUserLocation = YES;

The above code crashes on iOS 10 with the following log:

2016-08-08 01:31:07.211 EMOS1iOS[3019:181508] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid Region <center:-180.00000000, -180.00000000 span:nan, nan>'
*** First throw call stack:
(
  0   CoreFoundation                      0x000000010a12ca0b __exceptionPreprocess + 171
  1   libobjc.A.dylib                     0x0000000109b8e21e objc_exception_throw + 48
  2   CoreFoundation                      0x000000010a12c959 -[NSException raise] + 9
  3   MapKit                              0x0000000108ec28bc -[MKMapView setRegion:animated:] + 705
  4   MyApp                            0x0000000108a189a7 -[MapViewController viewDidLoad] + 887
  5   UIKit                               0x000000010b163269 -[UIViewController loadViewIfRequired] + 1258

I have fixed the issue by setting noLocation as below:

    CLLocation *location = [self.locationManager location];
    CLLocationCoordinate2D noLocation = [location coordinate];

Is this a iOS 10 beta 4 bug or is it an erroneous implementation from my side?