diff --git a/custom_components/waste_collection_schedule/waste_collection_schedule/source/renoweb_dk.py b/custom_components/waste_collection_schedule/waste_collection_schedule/source/renoweb_dk.py
index 55e23cbd..eb4df4bf 100644
--- a/custom_components/waste_collection_schedule/waste_collection_schedule/source/renoweb_dk.py
+++ b/custom_components/waste_collection_schedule/waste_collection_schedule/source/renoweb_dk.py
@@ -91,7 +91,7 @@ class Source:
     @property
     def _address_id(self) -> int:
         """Return the address id."""
-        if not hasattr(self, "__address_id"):
+        if not hasattr(self, f"_{self.__class__.__name__}__address_id"):
             self._get_address_id()
 
         return self.__address_id
@@ -110,7 +110,12 @@ class Source:
         response.raise_for_status()
 
         # For some reason the response is a JSON structure inside a JSON string
-        for entry in json.loads(response.json()["d"])["list"]:
+        waste_schemes = json.loads(response.json()["d"])["list"]
+
+        if not waste_schemes:
+            raise ValueError("No waste schemes found, check address or address_id")
+
+        for entry in waste_schemes:
             if not entry["afhentningsbestillingmateriel"] and re.search(
                 r"dag den \d{2}-\d{2}-\d{4}", entry["toemningsdato"]
             ):
diff --git a/doc/source/renoweb_dk.md b/doc/source/renoweb_dk.md
index e9447a57..227d22ba 100644
--- a/doc/source/renoweb_dk.md
+++ b/doc/source/renoweb_dk.md
@@ -22,7 +22,7 @@ _(String) (required)_
 The name of the municipality as it appears in the URL. E.g. https://htk.renoweb.dk/Legacy/selvbetjening/mit_affald.aspx where "htk" is for Høje-Taastrup municipality.
 
 **address**
-_(String) (required)_
+_(String) (optional)_
 
 The address to look up. It should be exactly as it is on the website until the comma between the street address and the postal code.
 
@@ -31,6 +31,8 @@ _(Int) (optional)_
 
 Use address_id if the address lookup fails.
 
+_Note that while both **address** and **address_id** are optional, one of them must be supplied and if both are used, **address_id** will take precedence._
+
 ## Example
 
 ```yaml