diff --git a/custom_components/localtuya/sensor.py b/custom_components/localtuya/sensor.py
index f1ed21e..bd73814 100644
--- a/custom_components/localtuya/sensor.py
+++ b/custom_components/localtuya/sensor.py
@@ -62,7 +62,7 @@ class LocaltuyaSensor(LocalTuyaEntity):
         """Device status was updated."""
         state = self.dps(self._dp_id)
         scale_factor = self._config.get(CONF_SCALING)
-        if scale_factor is not None:
+        if scale_factor is not None and isinstance(state, (int, float)):
             state = round(state * scale_factor, DEFAULT_PRECISION)
         self._state = state