unmount viewer error

[PetukhovArt]

when i change my route , the error :

    if (globalThis.Cesium) {
      viewer.imageryLayers.layerAdded.removeEventListener(onImageryLayerAdded)
      eventsState.registerEvents(false)
    }

error apperas on unmount method of useViewer , when call viewer.imageryLayers ,
Cesium core throws error on trying to take scene
[from this.](scene:{get:function(){return this._cesiumWidget.scene}})

After that , if i try to load viewer component it can't load ( endless waiting )

can u suggest smth to avoid it ?