continues crash on camera preview : issue in camera rendering

[aviontechnology]

please provied solution for below issue :

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.remfit.pillowsuggester, PID: 4655
java.lang.NullPointerException: Attempt to read from field 'java.lang.Object android.util.Pair.second' on a null object reference
at com.remfit.pillowsuggester.CameraFilter.CameraRenderer.onSurfaceTextureAvailable(CameraRenderer.java:159)
at android.view.TextureView.getHardwareLayer(TextureView.java:370)
at android.view.View.updateDisplayListIfDirty(View.java:14274)
at android.view.View.getDisplayList(View.java:14319)
at android.view.View.draw(View.java:15089)
at android.view.ViewGroup.drawChild(ViewGroup.java:3405)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.updateDisplayListIfDirty(View.java:14292)
at android.view.View.getDisplayList(View.java:14319)
at android.view.View.draw(View.java:15089)
at android.view.ViewGroup.drawChild(ViewGroup.java:3405)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15364)
at android.widget.FrameLayout.draw(FrameLayout.java:600)
at android.view.View.updateDisplayListIfDirty(View.java:14297)
at android.view.View.getDisplayList(View.java:14319)
at android.view.View.draw(View.java:15089)
at android.view.ViewGroup.drawChild(ViewGroup.java:3405)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15364)
at android.view.View.updateDisplayListIfDirty(View.java:14297)
at android.view.View.getDisplayList(View.java:14319)
at android.view.View.draw(View.java:15089)
at android.view.ViewGroup.drawChild(ViewGroup.java:3405)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.updateDisplayListIfDirty(View.java:14292)
at android.view.View.getDisplayList(View.java:14319)
at android.view.View.draw(View.java:15089)
at android.view.ViewGroup.drawChild(ViewGroup.java:3405)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.updateDisplayListIfDirty(View.java:14292)
at android.view.View.getDisplayList(View.java:14319)
at android.view.View.draw(View.java:15089)
at android.view.ViewGroup.drawChild(ViewGroup.java:3405)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15364)
at android.widget.FrameLayout.draw(FrameLayout.java:600)
at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2835)
at android.view.View.updateDisplayListIfDirty(View.java:14297)
at android.view.View.getDisplayList(View.java:14319)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:273)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:279)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:318)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2646)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2468)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2098)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1161)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6198)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5280)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:963)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:758)