java.lang.NullPointerException: This exception has no message.

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NullPointerException using fragment transactions

This exception has no message.

java.lang.NullPointerException: 	at com.hfad.predictandwin.Fragments.QuestionDetail.showDetails(QuestionDetail.java:50)	at com.hfad.predictandwin.MainActivity.onQuestionListener(MainActivity.java:34)	at com.hfad.predictandwin.Fragments.QuestionListFragment$1.onClick(QuestionListFragment.java:55)	at com.hfad.predictandwin.QuestionAdapter.onClick(QuestionAdapter.java:61)	at android.view.View.performClick(View.java:4475)	at android.view.View$PerformClick.run(View.java:18786)	at android.os.Handler.handleCallback(Handler.java:730)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:176)	at android.app.ActivityThread.main(ActivityThread.java:5419)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:525)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)	at dalvik.system.NativeStart.main(Native Method)