app crash when rotate the screen about html5webview HOT 1 OPEN

Here is error log.

02-21 12:45:36.605: E/SurfaceTextureClient(17222): 
ISurfaceTexture::setBufferCount(0) returned No such device
02-21 12:46:17.395: E/AndroidRuntime(17222): FATAL EXCEPTION: main
02-21 12:46:17.395: E/AndroidRuntime(17222): java.lang.NullPointerException
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
android.webkit.HTML5VideoView.isPlaying(HTML5VideoView.java:179)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
android.webkit.HTML5VideoViewProxy$VideoPlayer.isPlaying(HTML5VideoViewProxy.jav
a:276)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
android.webkit.HTML5VideoViewProxy.handleMessage(HTML5VideoViewProxy.java:475)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
android.os.Handler.dispatchMessage(Handler.java:99)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
android.os.Looper.loop(Looper.java:137)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
android.app.ActivityThread.main(ActivityThread.java:4898)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
java.lang.reflect.Method.invokeNative(Native Method)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
java.lang.reflect.Method.invoke(Method.java:511)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
02-21 12:46:17.395: E/AndroidRuntime(17222):    at 
dalvik.system.NativeStart.main(Native Method)