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Attempt to invoke interface method 'java.util.Iterator java.util.Set.iterator()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.Set.iterator()' on a null object reference at com.geolore.flagquiz.MainActivityFragment.resetQuiz(MainActivityFragment.java:137) at com.geolore.flagquiz.MainActivity.onStart(MainActivity.java:67) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1259) at android.app.Activity.performStart(Activity.java:6026) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)