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Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference	at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1646)	at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:585)	at android.support.v4.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:600)	at marg.uk.fourthoffice.fragments.BCMasterDetailFragment.popBackStack(MyMasterDetailFragment.java:140)	at marg.uk.fourthoffice.activities.BCOfficeActivity.onBackPressed(MainActivity.java:173)	at marg.uk.fourthoffice.fragments.BCSwipeableCardsFragment$1.onClick(MyOtherFragment.java:189)