IndexOutOfBoundsException in DepartureAdapter

[grote]

Exception java.lang.IndexOutOfBoundsException: Asked to get item at -1 but size is 0
  at androidx.recyclerview.widget.SortedList.get (SortedList.java:706)
  at de.grobox.transportr.departures.DepartureAdapter.getItem (DepartureAdapter.java:96)
  at de.grobox.transportr.departures.DeparturesActivity.loadMoreDepartures (DeparturesActivity.java:238)
  at de.grobox.transportr.departures.DeparturesActivity.lambda$onCreate$0 (DeparturesActivity.java:127)
  at de.grobox.transportr.departures.DeparturesActivity.$r8$lambda$3f5aVX6MH5h4XzeWB06Qw6Y12cc (DeparturesActivity.java)
  at de.grobox.transportr.departures.DeparturesActivity$$ExternalSyntheticLambda0.onRefresh (R8$$SyntheticClass)
  at com.omadahealth.github.swipyrefreshlayout.library.SwipyRefreshLayout$1.onAnimationEnd (SwipyRefreshLayout.java:176)
  at com.omadahealth.github.swipyrefreshlayout.library.CircleImageView.onAnimationEnd (CircleImageView.java:108)

[Altonss]

Do you have any idea why this bug happened?