diff --git a/app/routes/admin.py b/app/routes/admin.py
index 6b25bb5..2689337 100644
--- a/app/routes/admin.py
+++ b/app/routes/admin.py
@@ -121,55 +121,63 @@ def _slugify(name: str) -> str:
 
 @admin_bp.route('/create_config', methods=['POST'])
 def admin_create_config():
-    data = request.get_json() or {}
-    name = data.get('name') or 'Neue Lok'
-    hub_id = int(data.get('hub_id', 0))
-    hub_type = data.get('hub_type', '4channel')
-    image = data.get('image')
+    try:
+        data = request.get_json(force=True, silent=True) or {}
+        name = data.get('name') or 'Neue Lok'
+        hub_id = int(data.get('hub_id', 0))
+        hub_type = data.get('hub_type', '4channel')
+        image = data.get('image')
 
-    filename = _slugify(name) + '.json'
-    path = os.path.join(current_app.config['CONFIG_DIR'], filename)
-    if os.path.exists(path):
-        return jsonify({"success": False, "message": "Datei existiert bereits"}), 400
+        filename = _slugify(name) + '.json'
+        path = os.path.join(current_app.config['CONFIG_DIR'], filename)
+        if os.path.exists(path):
+            return jsonify({"success": False, "message": "Datei existiert bereits"}), 400
 
-    template = {
-        "name": name,
-        "image": image or "",
-        "hub_id": hub_id,
-        "hub_type": hub_type,
-        "channels": [],
-        "sounds": []
-    }
-    os.makedirs(current_app.config['CONFIG_DIR'], exist_ok=True)
-    with open(path, 'w', encoding='utf-8') as f:
-        json.dump(template, f, ensure_ascii=False, indent=2)
-    logger.info(f"Neue Config angelegt: {filename}")
-    return jsonify({"success": True, "filename": filename})
+        template = {
+            "name": name,
+            "image": image or "",
+            "hub_id": hub_id,
+            "hub_type": hub_type,
+            "channels": [],
+            "sounds": []
+        }
+        os.makedirs(current_app.config['CONFIG_DIR'], exist_ok=True)
+        with open(path, 'w', encoding='utf-8') as f:
+            json.dump(template, f, ensure_ascii=False, indent=2)
+        logger.info(f"Neue Config angelegt: {filename}")
+        return jsonify({"success": True, "filename": filename})
+    except Exception as e:
+        logger.exception("create_config fehlgeschlagen")
+        return jsonify({"success": False, "message": str(e)}), 500
 
 
 @admin_bp.route('/create_theme', methods=['POST'])
 def admin_create_theme():
-    data = request.get_json() or {}
-    name = data.get('name') or 'Neues Theme'
-    folder = data.get('folder') or _slugify(name)
-    filename = data.get('filename') or 'theme.json'
+    try:
+        data = request.get_json(force=True, silent=True) or {}
+        name = data.get('name') or 'Neues Theme'
+        folder = data.get('folder') or _slugify(name)
+        filename = data.get('filename') or 'theme.json'
 
-    base_dir = current_app.config['SOUNDBOARD_CONFIG_DIR']
-    theme_dir = os.path.join(base_dir, folder)
-    os.makedirs(theme_dir, exist_ok=True)
-    path = os.path.join(theme_dir, filename)
-    if os.path.exists(path):
-        return jsonify({"success": False, "message": "Theme-Datei existiert bereits"}), 400
+        base_dir = current_app.config['SOUNDBOARD_CONFIG_DIR']
+        theme_dir = os.path.join(base_dir, folder)
+        os.makedirs(theme_dir, exist_ok=True)
+        path = os.path.join(theme_dir, filename)
+        if os.path.exists(path):
+            return jsonify({"success": False, "message": "Theme-Datei existiert bereits"}), 400
 
-    template = {
-        "name": name,
-        "backgrounds": [],
-        "sounds": [],
-        "random_pool": [],
-        "random_limit_per_hour": 2,
-        "random_window_minutes": 60
-    }
-    with open(path, 'w', encoding='utf-8') as f:
-        json.dump(template, f, ensure_ascii=False, indent=2)
-    logger.info(f"Neues Theme angelegt: {os.path.relpath(path, base_dir)}")
-    return jsonify({"success": True, "path": os.path.relpath(path, base_dir)})
+        template = {
+            "name": name,
+            "backgrounds": [],
+            "sounds": [],
+            "random_pool": [],
+            "random_limit_per_hour": 2,
+            "random_window_minutes": 60
+        }
+        with open(path, 'w', encoding='utf-8') as f:
+            json.dump(template, f, ensure_ascii=False, indent=2)
+        logger.info(f"Neues Theme angelegt: {os.path.relpath(path, base_dir)}")
+        return jsonify({"success": True, "path": os.path.relpath(path, base_dir)})
+    except Exception as e:
+        logger.exception("create_theme fehlgeschlagen")
+        return jsonify({"success": False, "message": str(e)}), 500
diff --git a/configs/moc-130550-sierra-railway-no-3-locomotivelesdiylesdiy-286276.webp b/configs/moc-130550-sierra-railway-no-3-locomotivelesdiylesdiy-286276.webp
new file mode 100644
index 0000000..524f5e5
Binary files /dev/null and b/configs/moc-130550-sierra-railway-no-3-locomotivelesdiylesdiy-286276.webp differ
diff --git a/templates/admin.html b/templates/admin.html
index 5cddd03..5dc2b03 100644
--- a/templates/admin.html
+++ b/templates/admin.html
@@ -212,7 +212,9 @@
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify(data)
       });
-      const json = await res.json();
+      const text = await res.text();
+      let json;
+      try { json = JSON.parse(text); } catch (_) { throw new Error('Serverantwort ist kein JSON:\n'+text); }
       if (!json.success) throw new Error(json.message || 'Fehler');
       alert('Konfiguration angelegt: ' + json.filename);
       location.reload();
@@ -233,7 +235,9 @@
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify(data)
       });
-      const json = await res.json();
+      const text = await res.text();
+      let json;
+      try { json = JSON.parse(text); } catch (_) { throw new Error('Serverantwort ist kein JSON:\n'+text); }
       if (!json.success) throw new Error(json.message || 'Fehler');
       alert('Theme angelegt: ' + json.path);
       location.reload();