diff --git a/plugins/netatmo.py b/plugins/netatmo.py
index de13efd..a8fd39b 100644
--- a/plugins/netatmo.py
+++ b/plugins/netatmo.py
@@ -174,7 +174,9 @@ def _first_module(modules: list, mtype: str) -> dict | None:
 
 def _all_indoor(modules: list, main: dict) -> list:
     """Alle Indoor-Sensoren: Main + alle NAModule4."""
-    indoor = [{"type": "NAMain", "name": main["name"], "tag": "M",
+    main_name = main.get("name", "Station")
+    indoor = [{"type": "NAMain", "name": main_name,
+               "tag": main_name[:2].upper(),  # Ersten 2 Buchstaben des Stationsnamens
                "data": main["data"], "battery_pct": None, "is_main": True}]
     for m in modules:
         if m["type"] == "NAModule4":