java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference

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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:1588)	at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570)	at android.support.v4.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:585)