title: Why am I getting a crash when exiting my Activity?
body: <p>I am experiencing a crash in my app when I quit (via the back button) out of my Activity. So far as I can tell this is happening in the Android codebase and not mine, but I'm not completely convinced of that.</p>
  
  <p>Here's the stacktrace from adb:</p>
  
  <pre><code>AndroidRuntime  E  Uncaught handler: thread main exiting due to uncaught exception
  AndroidRuntime  E  java.lang.RuntimeException: Unable to stop activity {MyApp/MyApp.MainActivity}: java.lang.NullPointerException
  AndroidRuntime  E      at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3097)
  AndroidRuntime  E      at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3159)
  AndroidRuntime  E      at android.app.ActivityThread.access$2400(ActivityThread.java:112)
  AndroidRuntime  E      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1724)
  AndroidRuntime  E      at android.os.Handler.dispatchMessage(Handler.java:99)
  AndroidRuntime  E      at android.os.Looper.loop(Looper.java:123)
  AndroidRuntime  E      at android.app.ActivityThread.main(ActivityThread.java:3948)
  AndroidRuntime  E      at java.lang.reflect.Method.invokeNative(Native Method)
  AndroidRuntime  E      at java.lang.reflect.Method.invoke(Method.java:521)
  AndroidRuntime  E      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
  AndroidRuntime  E      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
  AndroidRuntime  E      at dalvik.system.NativeStart.main(Native Method)
  AndroidRuntime  E  Caused by: java.lang.NullPointerException
  AndroidRuntime  E      at android.app.Activity.performStop(Activity.java:3575)
  AndroidRuntime  E      at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3092)
  AndroidRuntime  E      ... 11 more
  </code></pre>
  
  <p>Anyone have any ideas/recommendations?</p>