also clear

src/domain/RootViewModel.js

@@ -63,6 +63,7 @@ export class RootViewModel extends ViewModel {
                     // this should never happen, but we want to be sure not to leak it
                     if (this._pendingSessionContainer) {
                         this._pendingSessionContainer.dispose();
+                        this._pendingSessionContainer = null
                     }
                     this._showSessionLoader(sessionId);
                 }