diff --git a/src/main/java/de/dennisguse/opentracks/data/models/HeartRate.java b/src/main/java/de/dennisguse/opentracks/data/models/HeartRate.java
index 622eda7c1..ea1f4d2b0 100644
--- a/src/main/java/de/dennisguse/opentracks/data/models/HeartRate.java
+++ b/src/main/java/de/dennisguse/opentracks/data/models/HeartRate.java
@@ -1,6 +1,7 @@
 package de.dennisguse.opentracks.data.models;
 
 public record HeartRate(float value) {
+    public static HeartRate INVALID = HeartRate.of(0.0f);
 
     public static HeartRate of(float value) {
         return new HeartRate(value);
@@ -9,4 +10,8 @@ public record HeartRate(float value) {
     public float getBPM() {
         return value;
     }
+
+    public boolean isValid() {
+        return !this.equals(INVALID);
+    }
 }
diff --git a/src/main/java/de/dennisguse/opentracks/sensors/sensorData/AggregatorHeartRate.java b/src/main/java/de/dennisguse/opentracks/sensors/sensorData/AggregatorHeartRate.java
index c46434f88..22c7bea24 100644
--- a/src/main/java/de/dennisguse/opentracks/sensors/sensorData/AggregatorHeartRate.java
+++ b/src/main/java/de/dennisguse/opentracks/sensors/sensorData/AggregatorHeartRate.java
@@ -12,7 +12,9 @@ public class AggregatorHeartRate extends Aggregator<HeartRate, HeartRate> {
 
     @Override
     protected void computeValue(Raw<HeartRate> current) {
-        this.aggregatedValue = current.value();
+        if (current.value().isValid()) {
+            this.aggregatedValue = current.value();
+        }
     }
 
     @Override
diff --git a/src/main/java/de/dennisguse/opentracks/sensors/sensorData/SensorDataSet.java b/src/main/java/de/dennisguse/opentracks/sensors/sensorData/SensorDataSet.java
index eacfc9e49..3cf3b8058 100644
--- a/src/main/java/de/dennisguse/opentracks/sensors/sensorData/SensorDataSet.java
+++ b/src/main/java/de/dennisguse/opentracks/sensors/sensorData/SensorDataSet.java
@@ -64,7 +64,8 @@ public class SensorDataSet {
 
     public Pair<HeartRate, String> getHeartRate() {
         if (heartRate != null) {
-            return heartRate.getAggregatedValueWithSensorName(trackPointCreator.createNow());
+            Pair<HeartRate, String> value = heartRate.getAggregatedValueWithSensorName(trackPointCreator.createNow());
+            if (value.first.isValid()) return value;
         }
 
         return null;
diff --git a/src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementUtils.java b/src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementUtils.java
index 1c17fc3e2..c14514f86 100644
--- a/src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementUtils.java
+++ b/src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementUtils.java
@@ -161,7 +161,7 @@ class VoiceAnnouncementUtils {
         }
 
         Pair<HeartRate, String> heartrate = sensorDataSet.getHeartRate();
-        if (shouldVoiceAnnounceHeartRateCurrent() && heartrate != null && heartrate.first != null) { //TODO Check has an announcable value?
+        if (shouldVoiceAnnounceHeartRateCurrent() && heartrate != null && heartrate.first != null && heartrate.first.isValid()) { //TODO Check has an announcable value?
             int averageHeartRate = Math.round(heartrate.first.getBPM());
 
             builder.append(" ")