sending message to a Handler on a dead thread

[qq724418408]

java.lang.IllegalStateException: Handler (com.google.android.cameraview.CameraImpl$2) {c7663c0} sending message to a Handler on a dead thread
at android.os.MessageQueue.enqueueMessage(MessageQueue.java:545)
at android.os.Handler.enqueueMessage(Handler.java:661)
at android.os.Handler.sendMessageAtTime(Handler.java:630)
at android.os.Handler.sendMessageDelayed(Handler.java:600)
at android.os.Handler.sendEmptyMessageDelayed(Handler.java:564)
at android.os.Handler.sendEmptyMessage(Handler.java:549)
at com.google.android.cameraview.CameraImpl$3.onPreviewFrame(CameraImpl.java:140)
at android.hardware.Camera$EventHandler.handleMessage(Camera.java:1262)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6710)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)