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尝试显示标记的信息窗口时出现以下错误：

E/flutter ( 1712): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: PlatformException(Invalid markerId, showInfoWindow called with invalid markerId, null)

地图和标记显示正确，当我点击它们时，信息窗口也正确显示。但是，我的意图是始终显示两个标记上的信息窗口。目前我只是想在一个标记上显示问题。我一直使用调试器跟踪执行到 java 端的方法通道，但我从未看到传递了一个 null markerId。谢谢你的帮助。

这是我的代码：

  onMapCreated(GoogleMapController controller) async {

    final double padding = 150.0;
    final double width = mediaSize.width - padding;
    final double height = mediaSize.height - padding;

    // Create map bounds
    final bounds = createTargetBounds();

    // Build markers title and snippet information for both current location and destination
    final NumberFormat fmt = new NumberFormat('0', 'en_ZA');

    final startMarkerId = MarkerId('start');
    final startMarker = Marker(
      markerId: startMarkerId,
      position: LatLng(currentLocation.latitude, currentLocation.longitude),
      infoWindow: InfoWindow(title: 'You are here')
    );

    // Determine distance to destination
    double distance = await Geolocator().distanceBetween(
        bounds.southwest.latitude,
        bounds.southwest.longitude,
        bounds.northeast.latitude,
        bounds.northeast.longitude);
    final finishSnippetInfo = 'Approx ${fmt.format(distance)} meters away from you.';

    final finishMarkerId = MarkerId('finish');
    final finishMarker = Marker(
      markerId: finishMarkerId,
      position: LatLng(
          destination.latitude,
          destination.longitude
      ),
      infoWindow: InfoWindow(title: 'Delivery point', snippet: finishSnippetInfo),
      icon: await deliveryIcon
    );

    // Clear and add markers to map
    markers.clear();
    markers[startMarkerId] = startMarker;
    markers[finishMarkerId] = finishMarker;
    controller.showMarkerInfoWindow(startMarkerId);

    // Determine correct level of zoom
    double zoom =
        _getBoundsZoomLevel(bounds.northeast, bounds.southwest, width, height);
    controller.moveCamera(CameraUpdate.zoomTo(zoom));

    callBack();
  }
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