diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index b26130032fa6620d0686dfc19c63771f8500fbe7..63bf73299ed88b27497a90bb80d1b1a9dc722b8b 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -65,10 +65,6 @@ export class AppComponent implements OnInit, OnDestroy {
       this.setupFocusListeners();
 
       this.bs.getSysConfig().subscribe(sysConfig => {
-        this.mds.appConfig = new AppConfig(sysConfig, this.cts, this.mds.expectedApiVersion, this.sanitizer);
-        this.mds.appTitle$.next(this.mds.appConfig.appTitle);
-        this.mds.appConfig.applyBackgroundColors();
-        this.mds.globalWarning = this.mds.appConfig.warningMessage;
         if (!sysConfig) {
           this.mds.appError$.next({
             label: 'Server-Problem: Konnte Konfiguration nicht laden',
@@ -77,6 +73,11 @@ export class AppComponent implements OnInit, OnDestroy {
           });
           return;
         }
+        this.mds.appConfig = new AppConfig(sysConfig, this.cts, this.mds.expectedApiVersion, this.sanitizer);
+        this.mds.appTitle$.next(this.mds.appConfig.appTitle);
+        this.mds.appConfig.applyBackgroundColors();
+        this.mds.globalWarning = this.mds.appConfig.warningMessage;
+
         const authData = MainDataService.getAuthData();
         if (authData) {
           this.cts.addCustomTexts(authData.customTexts);
diff --git a/src/app/app.interceptor.ts b/src/app/app.interceptor.ts
index d17d952298dca4332a0192e717e86dbe5c87b34e..e0848c43d86709b77d35ea7f6ffa57faab8ebcad 100644
--- a/src/app/app.interceptor.ts
+++ b/src/app/app.interceptor.ts
@@ -37,7 +37,7 @@ export class AuthInterceptor implements HttpInterceptor {
       return next.handle(requestA).pipe(
         catchError(error => {
           const apiError = new ApiError(999);
-          if (error instanceof HttpErrorResponse) { // TODO is the opposite case even possible?
+          if (error instanceof HttpErrorResponse) {
             const httpError = error as HttpErrorResponse;
             apiError.code = httpError.status;
             apiError.info = `${httpError.message} // ${httpError.error}`;
@@ -112,6 +112,22 @@ export class AuthInterceptor implements HttpInterceptor {
                 }
               }
             }
+
+          } else if (error instanceof DOMException) {
+            apiError.info = `Fehler: ${error.name} // ${error.message}`
+            this.mds.appError$.next({
+              label: `Fehler: ${error.name}`,
+              description: error.message,
+              category: 'PROBLEM'
+            });
+
+          } else {
+            apiError.info = 'Unbekannter Fehler';
+            this.mds.appError$.next({
+              label: 'Unbekannter Fehler',
+              description: '',
+              category: 'PROBLEM'
+            });
           }
 
           return throwError(apiError);
diff --git a/src/app/config/app.config.ts b/src/app/config/app.config.ts
index 4ab3b7dccf1dca84666d66ab20f44a9d1f0c8283..08e255ab757427f47b91df4713ab677827fea611 100644
--- a/src/app/config/app.config.ts
+++ b/src/app/config/app.config.ts
@@ -74,8 +74,9 @@ export class AppConfig {
   ) {
     this.sanitizer = sanitizer;
     this.cts = cts;
-    this.customTexts = sysConfig.customTexts;
+
     if (sysConfig) {
+      this.customTexts = sysConfig.customTexts;
       this.setCustomTexts(sysConfig.customTexts);
       this.setAppConfig(sysConfig.appConfig);
       this.testConfig = sysConfig.testConfig;