NullPointerException in android.app.ActivityThread

问题:

So there is bug that keeps coming up with out anything in the trace related to me, here is a sample trace:

java.lang.NullPointerException
at android.app.ActivityThread.handleStopActivity(ActivityThread.java:2484)
at android.app.ActivityThread.access$1800(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:948)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3695)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
at dalvik.system.NativeStart.main(Native Method)

The other traces are similar with only the line number varying: 2484, 2472, and 2476.

Also the 3 reports that mention the device mention: M865 Huawei Ascend II which should have 2.3 on it.

After looking through the source for 2.1 - 4.1 ( my app minSdk is 7 ) at the given line numbers these are the lines that could have thrown the error:

2.3.7 - line 2472

2.3.6 - line 2472

private final void handleStopActivity(IBinder token, boolean show, int configChanges) {
    ActivityClientRecord r = mActivities.get(token);
    r.activity.mConfigChangeFlags |= configChanges; // line 2472

    StopInfo info = new StopInfo();
    performStopActivityInner(r, info, show);
    ...

Any ideas what is causing this and how to prevent it?