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    <p>I have the same problem. Initially the problem comes from initRange() if you remove a point which was a Max/Min. But after commenting initRange I still get a null pointer on line 'double removedY = removedEntry.getValue();' of remove(). It looks like mXY.removeByIndex(index); returns an element with value set to null but I can't find out why.</p> <p>I'm running on the last revision available on subversion. It looks to me like some kind of race condition maybe since it doesn't fail always a the same time. I built a "sliding-window" loop in which I maintain a given number of constant points on the chart. In this example it's just 3, so after the 3rd point every time i add one I remove another. At first logs look normal:</p> <pre><code>01-11 23:06:48.060: E/AChartGraph(2038): Added 1 item. getIndexForKey: 0 01-11 23:06:48.060: E/AChartGraph(2038): series1.getItemCount(): 1 01-11 23:06:48.060: E/AChartGraph(2038): Added 1 item. getIndexForKey: 1 01-11 23:06:48.060: E/AChartGraph(2038): series1.getItemCount(): 2 01-11 23:06:48.160: E/AChartGraph(2038): Added 1 item. getIndexForKey: 2 01-11 23:06:48.160: E/AChartGraph(2038): series1.getItemCount(): 3 01-11 23:06:48.160: E/AChartGraph(2038): Removed item 0. series1.getItemCount(): 2 01-11 23:06:48.160: E/AChartGraph(2038): Added 1 item. getIndexForKey: 2 01-11 23:06:48.160: E/AChartGraph(2038): series1.getItemCount(): 3 01-11 23:06:48.160: E/AChartGraph(2038): Removed item 0. series1.getItemCount(): 2 01-11 23:06:48.160: E/AChartGraph(2038): Added 1 item. getIndexForKey: 2 01-11 23:06:48.160: E/AChartGraph(2038): series1.getItemCount(): 3 01-11 23:06:48.160: E/AChartGraph(2038): Removed item 0. series1.getItemCount(): 2 01-11 23:06:48.160: E/AChartGraph(2038): Added 1 item. getIndexForKey: 2 01-11 23:06:48.160: E/AChartGraph(2038): series1.getItemCount(): 3 </code></pre> <p>This goes on and on a bit until this happens:</p> <pre><code>01-11 23:06:55.300: E/AChartGraph(2038): Added 1 item. getIndexForKey: 2 01-11 23:06:55.300: E/AChartGraph(2038): series1.getItemCount(): 3 01-11 23:06:55.300: E/AChartGraph(2038): Removed item 0. series1.getItemCount(): 2 01-11 23:06:55.300: E/AChartGraph(2038): Added 1 item. getIndexForKey: 1 01-11 23:06:55.300: E/AChartGraph(2038): series1.getItemCount(): 2 01-11 23:06:55.300: E/AChartGraph(2038): Removed item 0. series1.getItemCount(): 1 01-11 23:06:55.300: E/AChartGraph(2038): Added 1 item. getIndexForKey: 2 01-11 23:06:55.300: E/AChartGraph(2038): series1.getItemCount(): 2 01-11 23:06:55.300: W/dalvikvm(2038): threadid=14: thread exiting with uncaught exception (group=0x40bfb930) 01-11 23:06:55.320: E/AndroidRuntime(2038): FATAL EXCEPTION: AsyncTask #4 01-11 23:06:55.320: E/AndroidRuntime(2038): java.lang.RuntimeException: An error occured while executing doInBackground() 01-11 23:06:55.320: E/AndroidRuntime(2038): at android.os.AsyncTask$3.done(AsyncTask.java:299) 01-11 23:06:55.320: E/AndroidRuntime(2038): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 01-11 23:06:55.320: E/AndroidRuntime(2038): at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 01-11 23:06:55.320: E/AndroidRuntime(2038): at java.util.concurrent.FutureTask.run(FutureTask.java:239) 01-11 23:06:55.320: E/AndroidRuntime(2038): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 01-11 23:06:55.320: E/AndroidRuntime(2038): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 01-11 23:06:55.320: E/AndroidRuntime(2038): at java.lang.Thread.run(Thread.java:856) 01-11 23:06:55.320: E/AndroidRuntime(2038): Caused by: java.lang.NullPointerException 01-11 23:06:55.320: E/AndroidRuntime(2038): at org.achartengine.model.XYSeries.getY(XYSeries.java:169) 01-11 23:06:55.320: E/AndroidRuntime(2038): at org.achartengine.model.XYSeries.initRange(XYSeries.java:83) 01-11 23:06:55.320: E/AndroidRuntime(2038): at org.achartengine.model.XYSeries.remove(XYSeries.java:140) 01-11 23:06:55.320: E/AndroidRuntime(2038): at com.mbev.android.Tmty.Helpers.AChartGraph.addAndPrune(AChartGraph.java:226) 01-11 23:06:55.320: E/AndroidRuntime(2038): at com.mbev.android.Tmty.DashboardFragment$startUpdateTmtyThread.doInBackground(DashboardFragment.java:284) 01-11 23:06:55.320: E/AndroidRuntime(2038): at com.mbev.android.Tmty.DashboardFragment$startUpdateTmtyThread.doInBackground(DashboardFragment.java:1) 01-11 23:06:55.320: E/AndroidRuntime(2038): at android.os.AsyncTask$2.call(AsyncTask.java:287) 01-11 23:06:55.320: E/AndroidRuntime(2038): at java.util.concurrent.FutureTask.run(FutureTask.java:234) 01-11 23:06:55.320: E/AndroidRuntime(2038): ... 3 more </code></pre> <p>Notice how suddenly the index for the added point is 1 instead of 2, and the itemCount goes down to 2 also, we've just lost a point!. If we test this with more points it takes longer and we see logs in which we gradually start "loosing" points until it crashes on XYSeries.getY. I believe it is trying to remove one of those points which mysteriously disappeared earlier.</p> <p><strong>EDIT 1:</strong> In this case I was plotting a time-series and the error came when I added 2 points with the same key (date in this case). <strong>The remove function removes all points for a given key, not sure if it's intended or a bug though.</strong> But it might well be the same error you have.</p>
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