Program: 79470
Project: 79470
Buggy source:
@Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState){
  View view=inflater.inflate(R.layout.fragment_study_session,container,false);
  activity=(MainActivity)getActivity();
  String id=getArguments().getString(KEY_COURSE_ID);
  realm=Realm.getDefaultInstance();
  course=realm.where(Course.class).equalTo("String_Node_Str",id).findFirst();
  if (course.getCurrentDay() == null || course.getCurrentDay().isCompleted())   course.prepareNextDay(realm);
  remainingRepsText=view.findViewById(R.id.remainingRepsText);
  remainingTimeText=view.findViewById(R.id.remainingTimeText);
  playPauseImage=view.findViewById(R.id.playPauseImage);
  sentencesLayout=view.findViewById(R.id.sentencesLayout);
  baseLanguageCodeText=view.findViewById(R.id.baseLanguageCodeText);
  baseSentenceText=view.findViewById(R.id.baseSentenceText);
  baseAlternateSentenceText=view.findViewById(R.id.baseAlternateSentenceText);
  baseAlternateSentenceLayout=view.findViewById(R.id.baseAlternateSentenceLayout);
  baseRomanizationText=view.findViewById(R.id.baseRomanizationText);
  baseRomanizationLayout=view.findViewById(R.id.baseRomanizationLayout);
  baseIpaText=view.findViewById(R.id.baseIpaText);
  baseIpaLayout=view.findViewById(R.id.baseIpaLayout);
  targetLanguageCodeText=view.findViewById(R.id.targetLanguageCodeText);
  targetSentenceText=view.findViewById(R.id.targetSentenceText);
  targetAlternateSentenceText=view.findViewById(R.id.targetAlternateSentenceText);
  targetAlternateSentenceLayout=view.findViewById(R.id.targetAlternateSentenceLayout);
  targetRomanizationText=view.findViewById(R.id.targetRomanizationText);
  targetRomanizationLayout=view.findViewById(R.id.targetRomanizationLayout);
  targetIpaText=view.findViewById(R.id.targetIpaText);
  targetIpaLayout=view.findViewById(R.id.targetIpaLayout);
  baseLanguageCodeText.setText(course.getBaseLanguage().getLanguageId());
  targetLanguageCodeText.setText(course.getTargetLanguage().getLanguageId());
  TextView courseTitleLabel=view.findViewById(R.id.courseTitleText);
  courseTitleLabel.setText(course.getTitle());
  sentencesLayout.setVisibility(View.INVISIBLE);
  playPauseImage.setOnClickListener(this::playPause);
  return view;
}

Fixed version (ground truth):
@Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState){
  View view=inflater.inflate(R.layout.fragment_study_session,container,false);
  activity=(MainActivity)getActivity();
  if (savedInstanceState != null) {
    isPaused=savedInstanceState.getBoolean(KEY_IS_PAUSED,true);
  }
 else {
    isPaused=true;
  }
  String id=getArguments().getString(KEY_COURSE_ID);
  realm=Realm.getDefaultInstance();
  course=realm.where(Course.class).equalTo("String_Node_Str",id).findFirst();
  if (course.getCurrentDay() == null || course.getCurrentDay().isCompleted())   course.prepareNextDay(realm);
  loadViews(view);
  baseLanguageCodeText.setText(course.getBaseLanguage().getLanguageId());
  targetLanguageCodeText.setText(course.getTargetLanguage().getLanguageId());
  TextView courseTitleLabel=view.findViewById(R.id.courseTitleText);
  courseTitleLabel.setText(course.getTitle());
  sentencesLayout.setVisibility(View.INVISIBLE);
  playPauseImage.setOnClickListener(this::playPause);
  return view;
}