java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke virtual method 'void fr.free.nrw.commons.contributions.ContributionController.saveState(android.os.Bundle)' on a null object reference at fr.free.nrw.commons.contributions.ContributionsListFragment.onSaveInstanceState(ContributionsListFragment.java:87) at android.support.v4.app.Fragment.performSaveInstanceState(Fragment.java:2124) at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1771) at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1839) at android.support.v4.app.FragmentController.saveAllState(FragmentController.java:134) at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:565) at android.support.v7.app.AppCompatActivity.onSaveInstanceState(AppCompatActivity.java:502) at fr.free.nrw.commons.auth.AuthenticatedActivity.onSaveInstanceState(AuthenticatedActivity.java:142) at fr.free.nrw.commons.contributions.ContributionsActivity.onSaveInstanceState(ContributionsActivity.java:133) at android.app.Activity.performSaveInstanceState(Activity.java:1298) at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1288) at android.app.ActivityThread.callCallActivityOnSaveInstanceState(ActivityThread.java:4064) at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3475) at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3531) at android.app.ActivityThread.access$1100(ActivityThread.java:156) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:211) at android.app.ActivityThread.main(ActivityThread.java:5389) 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:1020) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
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