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This exception has no message.
java.lang.NullPointerException at com.vlille.checker.utils.ContextHelper.isNetworkAvailable(ContextHelper.java:21) at com.vlille.checker.ui.fragment.StationsListFragment.updateVisibleItems(StationsListFragment.java:202) at com.vlille.checker.ui.fragment.AllStationsFragment.updateVisibleItems(AllStationsFragment.java:27) at com.vlille.checker.ui.fragment.StationsListFragment.onScrollStateChanged(StationsListFragment.java:173) at com.vlille.checker.ui.fragment.AllStationsFragment.onScrollStateChanged(AllStationsFragment.java:27) at android.widget.AbsListView.reportScrollStateChange(AbsListView.java:3391) at android.widget.AbsListView$FlingRunnable.endFling(AbsListView.java:3452) at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:3521) at android.os.Handler.handleCallback(Handler.java:587) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:123) at android.app.ActivityThread.main(ActivityThread.java:4627) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:521) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) at dalvik.system.NativeStart.main(Native Method)