diff --git a/custom_components/ohme/binary_sensor.py b/custom_components/ohme/binary_sensor.py
index 92af83d..a17ccd8 100644
--- a/custom_components/ohme/binary_sensor.py
+++ b/custom_components/ohme/binary_sensor.py
@@ -139,7 +139,7 @@ def _calculate_state(self) -> bool:
         power = self.coordinator.data["power"]["watt"]
 
         # No last reading to go off, use power draw based state only - this lags
-        if not self._last_reading:
+        if not self._last_reading or not self._last_reading['power']:
             _LOGGER.debug("Last reading not found, default to power > 0")
             return power > 0