Attempt to invoke virtual method 'void android.os.Handler.removeCallbacks(java.lang.Runnable)' on a null object reference

[legendsayantan]

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.os.Handler.removeCallbacks(java.lang.Runnable)' on a null object reference
        at com.taishi.flipprogressdialog.FlipProgressDialog.onDestroyView(FlipProgressDialog.java:245)
        at android.app.Fragment.performDestroyView(Fragment.java:2747)
        at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1380)
        at android.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1581)
        at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1642)
        at android.app.FragmentManagerImpl.dispatchMoveToState(FragmentManager.java:3052)
        at android.app.FragmentManagerImpl.dispatchDestroy(FragmentManager.java:3032)
        at android.app.FragmentController.dispatchDestroy(FragmentController.java:250)
        at android.app.Activity.performDestroy(Activity.java:8403)
        at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1344)
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5463)
        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5507) 
        at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:44) 
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2328) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:255) 
        at android.app.ActivityThread.main(ActivityThread.java:8212) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)