Toastr doesn't appear nebular theme | angular 7

 While navigating from one page to another pages the toastr not working

Temporary Work around:

Go to node_modules/@nebular/theme/components/toastr/toastr.service.js
Go to line no:103
NbToastrContainerRegistry.prototype.get = function (position) {
var logicalPosition = this.positionHelper.toLogicalPosition(position);
// if (!this.overlays.has(logicalPosition)) {
this.instantiateContainer(logicalPosition);
// }
return this.overlays.get(logicalPosition);
};