diff --git a/src/calibre/gui2/library/alternate_views.py b/src/calibre/gui2/library/alternate_views.py index 83f45a0136..a1d3c54691 100644 --- a/src/calibre/gui2/library/alternate_views.py +++ b/src/calibre/gui2/library/alternate_views.py @@ -219,7 +219,7 @@ def dropEvent(self, event): row = self.indexAt(event.pos()).row() if row > -1 and ids: book_id = self.model().id(row) - if book_id: + if book_id and book_id not in ids: self.books_dropped.emit({book_id: ids}) event.setDropAction(Qt.CopyAction) event.accept()