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-rw-r--r--altoslib/AltosFlightSeries.java2
1 files changed, 1 insertions, 1 deletions
diff --git a/altoslib/AltosFlightSeries.java b/altoslib/AltosFlightSeries.java
index 944cff31..5cf552fc 100644
--- a/altoslib/AltosFlightSeries.java
+++ b/altoslib/AltosFlightSeries.java
@@ -216,7 +216,7 @@ public class AltosFlightSeries extends AltosDataListener {
private void compute_height() {
double ground_altitude = cal_data.ground_altitude;
- if (height_series == null && ground_altitude != AltosLib.MISSING) {
+ if (height_series == null && ground_altitude != AltosLib.MISSING && altitude_series != null) {
height_series = add_series(height_name, AltosConvert.height);
for (AltosTimeValue alt : altitude_series)
height_series.add(alt.time, alt.value - ground_altitude);