diff --git a/lib/services/navidrome_service.dart b/lib/services/navidrome_service.dart
index fcdd717..68c5def 100644
--- a/lib/services/navidrome_service.dart
+++ b/lib/services/navidrome_service.dart
@@ -120,6 +120,9 @@ class NavidromeService {
   bool get istVerbunden => _serverUrl.isNotEmpty && _user.isNotEmpty;
 
   Uri _uri(String endpoint, [Map<String, String>? extra]) {
+    if (_token == null || _token!.isEmpty) {
+      throw StateError('Navidrome ist nicht verbunden. Bitte zuerst Zugangsdaten setzen.');
+    }
     final params = {
       'u': _user,
       't': _token!,