SI-1702: Bugfix (update marker) Signed-off-by: Dennis Schmitt <dennis.schmitt@pta.de>

diff --git a/projects/grid-failure-information-app/src/app/pages/grid-failure/grid-failure-details/grid-failure-details.sandbox.ts b/projects/grid-failure-information-app/src/app/pages/grid-failure/grid-failure-details/grid-failure-details.sandbox.ts
index 17b54d7..7304950 100644
--- a/projects/grid-failure-information-app/src/app/pages/grid-failure/grid-failure-details/grid-failure-details.sandbox.ts
+++ b/projects/grid-failure-information-app/src/app/pages/grid-failure/grid-failure-details/grid-failure-details.sandbox.ts

@@ -344,10 +344,13 @@
         this.appState$.dispatch(gridFailureActions.loadGridFailureAddress({ payload: failureHousenumber.uuid }));
       }
     }
-    test$.pipe(take(1)).subscribe(addresses => {
-      const failureHousenumber: models.FailureHousenumber = addresses.find((housenumber: models.FailureHousenumber) => {
-        return housenumber.housenumber === hsnr;
-      });
+    test$.pipe(take(1)).subscribe((addresses: Array<models.FailureHousenumber>) => {
+      let failureHousenumber: models.FailureHousenumber;
+      if (!!addresses && addresses.length > 0) {
+        failureHousenumber = addresses.find((housenumber: models.FailureHousenumber) => {
+          return housenumber.housenumber === hsnr;
+        });
+      }
       if (!!failureHousenumber) {
         this.appState$.dispatch(gridFailureActions.loadGridFailureAddress({ payload: failureHousenumber.uuid }));
       }