diff --git a/src/androidTest/java/de/dennisguse/opentracks/chart/ChartValueSeriesTest.java b/src/androidTest/java/de/dennisguse/opentracks/chart/ChartValueSeriesTest.java
index db9fb2dea..fbc852cde 100644
--- a/src/androidTest/java/de/dennisguse/opentracks/chart/ChartValueSeriesTest.java
+++ b/src/androidTest/java/de/dennisguse/opentracks/chart/ChartValueSeriesTest.java
@@ -52,7 +52,7 @@ public class ChartValueSeriesTest {
                 15,
                 18) {
             @Override
-            double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
+            Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getAltitude();
             }
 
diff --git a/src/androidTest/java/de/dennisguse/opentracks/fragments/ChartFragmentTest.java b/src/androidTest/java/de/dennisguse/opentracks/fragments/ChartFragmentTest.java
index 503b93f88..9bdf01a7a 100644
--- a/src/androidTest/java/de/dennisguse/opentracks/fragments/ChartFragmentTest.java
+++ b/src/androidTest/java/de/dennisguse/opentracks/fragments/ChartFragmentTest.java
@@ -39,6 +39,7 @@ import de.dennisguse.opentracks.content.data.TrackPoint;
 import de.dennisguse.opentracks.util.UnitConversions;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 
 /**
  * Tests {@link ChartFragment}.
@@ -83,9 +84,9 @@ public class ChartFragmentTest {
         ChartPoint point = chartFragment.createPendingPoint(trackPoint);
 
         // then
-        assertEquals(Float.NaN, point.getHeartRate(), 0.01);
-        assertEquals(Float.NaN, point.getCadence(), 0.01);
-        assertEquals(Float.NaN, point.getPower(), 0.01);
+        assertNull(point.getHeartRate());
+        assertNull(point.getCadence());
+        assertNull(point.getPower());
     }
 
     /**
diff --git a/src/main/java/de/dennisguse/opentracks/chart/ChartPoint.java b/src/main/java/de/dennisguse/opentracks/chart/ChartPoint.java
index dbd3f50cc..7357b1446 100644
--- a/src/main/java/de/dennisguse/opentracks/chart/ChartPoint.java
+++ b/src/main/java/de/dennisguse/opentracks/chart/ChartPoint.java
@@ -14,11 +14,11 @@ public class ChartPoint {
 
     //Y-axis
     private double altitude;
-    private double speed;
-    private double pace;
-    private double heartRate = Double.NaN;
-    private double cadence = Double.NaN;
-    private double power = Double.NaN;
+    private Double speed;
+    private Double pace;
+    private Double heartRate;
+    private Double cadence;
+    private Double power;
 
     @VisibleForTesting
     ChartPoint(double altitude) {
@@ -43,13 +43,13 @@ public class ChartPoint {
         pace = trackStatisticsUpdater.getSmoothedSpeed().toPace(metricUnits).toMillis() * UnitConversions.MS_TO_S * UnitConversions.S_TO_MIN;
         if (trackPoint != null) {
             if (trackPoint.hasHeartRate()) {
-                heartRate = trackPoint.getHeartRate_bpm();
+                heartRate = (double) trackPoint.getHeartRate_bpm();
             }
             if (trackPoint.hasCyclingCadence()) {
-                cadence = trackPoint.getCyclingCadence_rpm();
+                cadence = (double) trackPoint.getCyclingCadence_rpm();
             }
             if (trackPoint.hasPower()) {
-                power = trackPoint.getPower();
+                power = (double) trackPoint.getPower();
             }
         }
     }
@@ -58,39 +58,27 @@ public class ChartPoint {
         return timeOrDistance;
     }
 
-    public double getAltitude() {
+    public Double getAltitude() {
         return altitude;
     }
 
-    public double getSpeed() {
+    public Double getSpeed() {
         return speed;
     }
 
-    public double getPace() {
+    public Double getPace() {
         return pace;
     }
 
-    public boolean hasHeartRate() {
-        return Double.isNaN(heartRate);
-    }
-
-    public double getHeartRate() {
+    public Double getHeartRate() {
         return heartRate;
     }
 
-    public boolean hasCadence() {
-        return Double.isNaN(cadence);
-    }
-
-    public double getCadence() {
+    public Double getCadence() {
         return cadence;
     }
 
-    public boolean hasPower() {
-        return Double.isNaN(power);
-    }
-
-    public double getPower() {
+    public Double getPower() {
         return power;
     }
 }
diff --git a/src/main/java/de/dennisguse/opentracks/chart/ChartValueSeries.java b/src/main/java/de/dennisguse/opentracks/chart/ChartValueSeries.java
index 7075e8079..ab29f7887 100644
--- a/src/main/java/de/dennisguse/opentracks/chart/ChartValueSeries.java
+++ b/src/main/java/de/dennisguse/opentracks/chart/ChartValueSeries.java
@@ -132,10 +132,10 @@ abstract class ChartValueSeries {
         }
     }
 
-    abstract double extractDataFromChartPoint(@NonNull ChartPoint chartPoint);
+    abstract Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint);
 
     boolean isChartPointValid(@NonNull ChartPoint chartPoint) {
-        return !Double.isNaN(extractDataFromChartPoint(chartPoint));
+        return extractDataFromChartPoint(chartPoint) != null;
     }
 
     protected abstract boolean drawIfChartPointHasNoData();
diff --git a/src/main/java/de/dennisguse/opentracks/chart/ChartView.java b/src/main/java/de/dennisguse/opentracks/chart/ChartView.java
index 6f6ddb535..d907cbe60 100644
--- a/src/main/java/de/dennisguse/opentracks/chart/ChartView.java
+++ b/src/main/java/de/dennisguse/opentracks/chart/ChartView.java
@@ -206,7 +206,7 @@ public class ChartView extends View {
                 fontSizeSmall,
                 fontSizeMedium) {
             @Override
-            protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
+            protected Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getAltitude();
             }
 
@@ -227,7 +227,7 @@ public class ChartView extends View {
                 fontSizeSmall,
                 fontSizeMedium) {
             @Override
-            protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
+            protected Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getSpeed();
             }
 
@@ -249,7 +249,7 @@ public class ChartView extends View {
                 fontSizeSmall,
                 fontSizeMedium) {
             @Override
-            protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
+            protected Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getPace();
             }
 
@@ -271,7 +271,7 @@ public class ChartView extends View {
                 fontSizeSmall,
                 fontSizeMedium) {
             @Override
-            protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
+            protected Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getHeartRate();
             }
 
@@ -292,7 +292,7 @@ public class ChartView extends View {
                 fontSizeSmall,
                 fontSizeMedium) {
             @Override
-            protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
+            protected Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getCadence();
             }
 
@@ -312,7 +312,7 @@ public class ChartView extends View {
                 fontSizeSmall,
                 fontSizeMedium) {
             @Override
-            protected double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
+            protected Double extractDataFromChartPoint(@NonNull ChartPoint chartPoint) {
                 return chartPoint.getPower();
             }