MJPEG crash after some time

[nicogarcia]

02-27 16:54:33.331 10819-10844/com.gang.micro W/Surface: WARNING: Surface's mNativeObject (0x5ef18830) != mLockedObject (0x0)
02-27 16:54:33.341 10819-10844/com.gang.micro W/dalvikvm: threadid=17: thread exiting with uncaught exception (group=0x418b9ce0)
02-27 16:54:33.361 10819-10844/com.gang.micro E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #2
Process: com.gang.micro, PID: 10819
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.IllegalStateException: Surface was not locked
at android.view.Surface.unlockCanvasAndPost(Surface.java:279)
at android.view.SurfaceView$4.unlockCanvasAndPost(SurfaceView.java:852)
at com.gang.micro.mjpeg.MjpegView$MjpegViewThread.doInBackground(MjpegView.java:164)
at com.gang.micro.mjpeg.MjpegView$MjpegViewThread.doInBackground(MjpegView.java:49)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
at java.lang.Thread.run(Thread.java:841)