message: ref: check if addTag is defined instead
diff: @@ -744,7 +744,7 @@ export class NgSelectComponent implements OnDestroy, OnChanges, AfterViewInit, C
  }
  private _handleTab($event: KeyboardEvent) {
  - if (this.isOpen === false && this._manualOpen === false) {
  + if (this.isOpen === false && !isDefined(this.addTag)) {
  return;
  }
  if (this.selectOnTab) {
  