From 1b5b07a02023177f2f49b3f5d89410c2dc5c07a3 Mon Sep 17 00:00:00 2001
From: jonaswinkler <jonas.winkler@jpwinkler.de>
Date: Thu, 3 Dec 2020 18:37:25 +0100
Subject: [PATCH] bugfix

---
 src-ui/src/app/components/app-frame/app-frame.component.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src-ui/src/app/components/app-frame/app-frame.component.ts b/src-ui/src/app/components/app-frame/app-frame.component.ts
index c1f5e9479..34e804db4 100644
--- a/src-ui/src/app/components/app-frame/app-frame.component.ts
+++ b/src-ui/src/app/components/app-frame/app-frame.component.ts
@@ -90,7 +90,9 @@ export class AppFrameComponent implements OnInit, OnDestroy {
   }
 
   ngOnDestroy() {
-    this.openDocumentsSubscription.unsubscribe()
+    if (this.openDocumentsSubscription) {
+      this.openDocumentsSubscription.unsubscribe()
+    }
   }
 
 }