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java.lang.NullPointerException: Attempt to read from field 'java.lang.Object com.alorma.github.sdk.bean.issue.Story.item' on a null object reference	at com.alorma.github.ui.fragment.pullrequest.PullRequestConversationFragment.notifyHeadOfAdapter(PullRequestConversationFragment.java:339)	at com.alorma.github.ui.fragment.pullrequest.PullRequestConversationFragment.access$600(PullRequestConversationFragment.java:63)	at com.alorma.github.ui.fragment.pullrequest.PullRequestConversationFragment$3.onError(PullRequestConversationFragment.java:327)	at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:152)	at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:115)	at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:205)	at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:139)	at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:227)	at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)	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:5290)	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:908)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)