altoslib: Don't crash when map flight data is missing

[fw/altos] / altosuilib / AltosUIGraph.java

diff --git a/altosuilib/AltosUIGraph.java b/altosuilib/AltosUIGraph.java
index 098e9a52f17ebe28add7f8f3829f10f86279f278..da02451310416c47627a8a1b4251a5110d080f91 100644 (file)
--- a/altosuilib/AltosUIGraph.java
+++ b/altosuilib/AltosUIGraph.java
@@ -137,7 +137,8 @@ public class AltosUIGraph implements AltosUnitsListener, AltosShapeListener {
                this.series = null;
                this.axis_index = 0;
 
-               enable.register_shape_listener(this);
+               if (enable != null)
+                       enable.register_shape_listener(this);
 
                axes_added = new Hashtable<Integer,Boolean>();