addGeoJsonSource throws execption when using `await` keyword

As addGeoJsonSource is future, it makes sense to add the await keyword before it but when I use await it throws platform exception.

Here is the code snippet,

 void onMapCreated(MapboxMapController controller) {
    mapboxController = controller;
    if (mapboxMapType.isMapWithBoundaries) {
      _createMapWithBoundaries();
    } else if (mapboxMapType.isMapWithMarker) {
      _placeMarkerOnMap();
    }
  }

 Future<void> _createMapWithBoundaries() async {
    try {
      await mapboxController?.addGeoJsonSource(
        GeoJsonKeys.sourceId,
        <String, dynamic>{
          'type': 'FeatureCollection',
          'features': [
            {
              'type': 'Feature',
              'geometry': {
                'type': 'Polygon',
                'coordinates': landDetails?.boundaryCoordinates,
              }
            }
          ],
          'properties': <String, dynamic>{}
        },
      );
} catch(e){
//error
}
}

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Without await, it works fine

flutter-mapbox-gl / maps

addGeoJsonSource throws execption when using `await` keyword #1150