diff --git a/lib/patrix/sensors/DallasSensor.h b/lib/patrix/sensors/DallasSensor.h
index 6fcc3c9..4181f98 100644
--- a/lib/patrix/sensors/DallasSensor.h
+++ b/lib/patrix/sensors/DallasSensor.h
@@ -54,7 +54,7 @@ public:
       const double value = sensors.read(address);
       const time_t timestamp = sensors.getTimestamp();
       const unsigned long millisNow = millis();
-      const bool doPublish = !isnan(value) && (abs(lastSentValue - value) >= valueThreshold || millisNow - lastSentMillis >= minIntervalMillis);
+      const bool doPublish = !isnan(value) && (isnan(lastSentValue) || abs(lastSentValue - value) >= valueThreshold || millisNow - lastSentMillis >= minIntervalMillis);
       if (doPublish) {
         lastSentValue = value;
         lastSentMillis = millisNow;