listview filter suddenly broken

listview filter suddenly broken

I have a listview displaying contacts. Initially I display all contacts.
When I start typing the list goes blank, regardless of what I type.
@Override
public void onViewCreated(final View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
fillContacts();
contactList.setAdapter(geoAdapter);
...
@Override
public void afterTextChanged(Editable str) {
geoAdapter.getFilter().filter(str, new Filter.FilterListener() {
@Override
public void onFilterComplete(int i) {
geoAdapter.notifyDataSetChanged();
}
});
}