diff --git a/app/__init__.py b/app/__init__.py
index 018d56f..6c9924c 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -23,8 +23,10 @@ def create_app():
 
     from datetime import timedelta
 
-    def timedelta_filter(td):
-        return str(td)  # oder td.total_seconds() als Zahl
+    def timedelta_filter(value):
+        if isinstance(value, timedelta):
+            return value.total_seconds()  # oder str(value)
+        return value
 
     app.jinja_env.filters['timedelta'] = timedelta_filter
 
diff --git a/templates/base.html b/templates/base.html
index 7960d40..d1dd14b 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -90,7 +90,7 @@
   {% if config %}
     <script>
       // Config + globale Sounds nur setzen, wenn vorhanden
-      window.mkConfig = {{ config | tojson | safe | timedelta }};
+      window.mkConfig = {{ config | tojson | safe }};
       window.mkGlobalSounds = {{ global_sounds | tojson | safe }};
 
       console.log("base.html → mkConfig gesetzt:", window.mkConfig);