title: The argument type 'double?' can't be assigned to the parameter type 'double'. dart(argument_type_not_assignable)
body: <p>I'm trying to get the user current location, but I got this error on l.latitude and l.longitude</p>
  <p><strong>The argument type 'double?' can't be assigned to the parameter type 'double'.</strong></p>
  <pre><code>void _onMapCreated(GoogleMapController _cntlr) {
      _controller = _cntlr;
      _location.onLocationChanged.listen((l) {
        _controller.animateCamera(
          CameraUpdate.newCameraPosition(
            CameraPosition(
              target: LatLng(l.latitude, l.longitude),
              zoom: 15,
            ),
          ),
        );
      });
    }
  
  </code></pre>