I created a page view for biblio items (unformatted list of fields). When I add a filter criterium to the view on "Biblio: Author last name" and the exposed form is in a separate block, I get the following error when visiting the (view) page:

Notice: Undefined index: name in views_handler_filter->accept_exposed_input() (line 1273 of /path/to/docroot/sites/all/modules/views/handlers/views_handler_filter.inc).

The filter block also doesn't display a dropdown for the author lastname (only the label for the exposed filter field is displayed).

If I don't put the form for the exposed filters in a separate block but inside the view itself, the error disappears and the dropdown appears.