onDestroy needed for broadcast subscriptions

src/app/vault/export.component.ts

@@ -1,5 +1,6 @@
 import {
     Component,
+    OnDestroy,
     OnInit,
     NgZone,
 } from '@angular/core';
@@ -41,6 +42,10 @@ export class ExportComponent extends BaseExportComponent implements OnInit {
         });
     }
 
+    ngOnDestroy() {
+        this.broadcasterService.unsubscribe(BroadcasterSubscriptionId);
+    }
+
     onWindowHidden() {
         this.showPassword = false;
     }