App crashes in ContributionListFragment

[ashishkumar468]

System logs:

--------- beginning of crash
2019-07-09 11:25:17.416 13854-13854/fr.free.nrw.commons.beta E/AndroidRuntime: FATAL EXCEPTION: main
Process: fr.free.nrw.commons.beta, PID: 13854
java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri fr.free.nrw.commons.contributions.Contribution.getContentUri()' on a null object reference
at fr.free.nrw.commons.contributions.ContributionsListFragment.findIdOfItemWithPosition(ContributionsListFragment.java:220)
at fr.free.nrw.commons.contributions.ContributionsListFragment.onSaveInstanceState(ContributionsListFragment.java:202)
at androidx.fragment.app.Fragment.performSaveInstanceState(Fragment.java:2627)
at androidx.fragment.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManagerImpl.java:2267)
at androidx.fragment.app.FragmentManagerImpl.saveAllState(FragmentManagerImpl.java:2326)
at androidx.fragment.app.Fragment.performSaveInstanceState(Fragment.java:2629)
at androidx.fragment.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManagerImpl.java:2267)
at androidx.fragment.app.FragmentManagerImpl.saveAllState(FragmentManagerImpl.java:2326)
at androidx.fragment.app.FragmentController.saveAllState(FragmentController.java:150)
at androidx.fragment.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:496)
at androidx.appcompat.app.AppCompatActivity.onSaveInstanceState(AppCompatActivity.java:511)
at fr.free.nrw.commons.auth.AuthenticatedActivity.onSaveInstanceState(AuthenticatedActivity.java:49)
at fr.free.nrw.commons.contributions.MainActivity.onSaveInstanceState(MainActivity.java:102)
at android.app.Activity.performSaveInstanceState(Activity.java:1477)
at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1301)
at android.app.ActivityThread.callCallActivityOnSaveInstanceState(ActivityThread.java:4631)
at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3934)
at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3999)
at android.app.ActivityThread.-wrap25(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1559)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6238)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
2019-07-09 11:25:17.431 13854-13854/fr.free.nrw.commons.beta E/ACRA: ACRA caught a NullPointerException for fr.free.nrw.commons.beta
java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri fr.free.nrw.commons.contributions.Contribution.getContentUri()' on a null object reference
at fr.free.nrw.commons.contributions.ContributionsListFragment.findIdOfItemWithPosition(ContributionsListFragment.java:220)
at fr.free.nrw.commons.contributions.ContributionsListFragment.onSaveInstanceState(ContributionsListFragment.java:202)
at androidx.fragment.app.Fragment.performSaveInstanceState(Fragment.java:2627)
at androidx.fragment.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManagerImpl.java:2267)
at androidx.fragment.app.FragmentManagerImpl.saveAllState(FragmentManagerImpl.java:2326)
at androidx.fragment.app.Fragment.performSaveInstanceState(Fragment.java:2629)
at androidx.fragment.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManagerImpl.java:2267)
at androidx.fragment.app.FragmentManagerImpl.saveAllState(FragmentManagerImpl.java:2326)
at androidx.fragment.app.FragmentController.saveAllState(FragmentController.java:150)
at androidx.fragment.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:496)
at androidx.appcompat.app.AppCompatActivity.onSaveInstanceState(AppCompatActivity.java:511)
at fr.free.nrw.commons.auth.AuthenticatedActivity.onSaveInstanceState(AuthenticatedActivity.java:49)
at fr.free.nrw.commons.contributions.MainActivity.onSaveInstanceState(MainActivity.java:102)
at android.app.Activity.performSaveInstanceState(Activity.java:1477)
at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1301)
at android.app.ActivityThread.callCallActivityOnSaveInstanceState(ActivityThread.java:4631)
at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3934)
at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3999)
at android.app.ActivityThread.-wrap25(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1559)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6238)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)