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I use AdWhirl and Admob in one of my app,after release, we get a lot of error from adwhirl,and It's reproduce easily like this: After ad appear,I shutdown wifi,and wait ad timeout,then press back button to exit application. then the bug appear.the src can download from this .and the exception is like this: 05-17 11:00:13.265: E/AndroidRuntime(12482): java.lang.RuntimeException: Unable to destroy activity {me.test.admob/me.test.admob.AdWhirlTestActivity}: java.lang.NullPointerException 05-17 11:00:13.265: E/AndroidRuntime(12482): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3112) 05-17 11:00:13.265: E/AndroidRuntime(12482): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3130) 05-17 11:00:13.265: E/AndroidRuntime(12482): at android.app.ActivityThread.access$1200(ActivityThread.java:123) 05-17 11:00:13.265: E/AndroidRuntime(12482): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1180) 05-17 11:00:13.265: E/AndroidRuntime(12482): at android.os.Handler.dispatchMessage(Handler.java:99) 05-17 11:00:13.265: E/AndroidRuntime(12482): at android.os.Looper.loop(Looper.java:137) 05-17 11:00:13.265: E/AndroidRuntime(12482): at android.app.ActivityThread.main(ActivityThread.java:4424) 05-17 11:00:13.265: E/AndroidRuntime(12482): at java.lang.reflect.Method.invokeNative(Native Method) 05-17 11:00:13.265: E/AndroidRuntime(12482): at java.lang.reflect.Method.invoke(Method.java:511) 05-17 11:00:13.265: E/AndroidRuntime(12482): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 05-17 11:00:13.265: E/AndroidRuntime(12482): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 05-17 11:00:13.265: E/AndroidRuntime(12482): at dalvik.system.NativeStart.main(Native Method) 05-17 11:00:13.265: E/AndroidRuntime(12482): Caused by: java.la

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