diff --git a/custom_components/luxtronik/climate.py b/custom_components/luxtronik/climate.py
index e8ff67a..741b69c 100644
--- a/custom_components/luxtronik/climate.py
+++ b/custom_components/luxtronik/climate.py
@@ -331,7 +331,7 @@ def _handle_coordinator_update(
             self._last_hvac_mode_before_preset = None
 
         key = self.entity_description.luxtronik_key_current_temperature
-        if key is None:
+        if key is None or key == "":
             self._attr_current_temperature = None
         elif key.startswith("sensor."):
             temp = self.hass.states.get(key)