diff --git a/src/abbfreeathome/devices/base.py b/src/abbfreeathome/devices/base.py
index 744f307..3150ce2 100644
--- a/src/abbfreeathome/devices/base.py
+++ b/src/abbfreeathome/devices/base.py
@@ -103,6 +103,7 @@ def update_device(self, datapoint_key: str, datapoint_value: str):
             datapoint_key,
             datapoint_value,
         )
+        _refreshed = None
         _io_key = datapoint_key.split("/")[-1]
 
         if _io_key in self._outputs:
diff --git a/tests/test_base.py b/tests/test_base.py
index bee6f53..7312e11 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -89,3 +89,9 @@ def test_remove_callback(base_instance):
     base_instance.register_callback(callback)
     base_instance.remove_callback(callback)
     assert callback not in base_instance._callbacks
+
+
+def test_update_device(base_instance):
+    """Test when input-datapoint is provided."""
+
+    base_instance.update_device("AL_SWITCH_ON_OFF/idp0000", "1")