diff --git a/homeassistant/components/knx/knx_entity.py b/homeassistant/components/knx/knx_entity.py
index 296bcb2f540..f4597ad230e 100644
--- a/homeassistant/components/knx/knx_entity.py
+++ b/homeassistant/components/knx/knx_entity.py
@@ -40,12 +40,12 @@ class KnxEntity(Entity):
         """Store register state change callback."""
         self._device.register_device_updated_cb(self.after_update_callback)
 
-        if isinstance(self._device, XknxClimate):
+        if isinstance(self._device, XknxClimate) and self._device.mode is not None:
             self._device.mode.register_device_updated_cb(self.after_update_callback)
 
     async def async_will_remove_from_hass(self) -> None:
         """Disconnect device object when removed."""
         self._device.unregister_device_updated_cb(self.after_update_callback)
 
-        if isinstance(self._device, XknxClimate):
+        if isinstance(self._device, XknxClimate) and self._device.mode is not None:
             self._device.mode.unregister_device_updated_cb(self.after_update_callback)