message: fix: EventManager
diff: @@ -105,7 +105,7 @@ export default class EventManager {
  public constructor(scene: Cesium.Scene) {
  this.scene = scene;
  - this.sshe = new ScreenSpaceEventHandler(scene.canvas as HTMLCanvasElement);
  + this.sshe = new ScreenSpaceEventHandler(scene?.canvas as HTMLCanvasElement);
  }
  public destroy() {
  