diff --git a/main.py b/main.py
index ec1ff03..19aa029 100644
--- a/main.py
+++ b/main.py
@@ -369,7 +369,7 @@ def new_book():
             parent=request.form['add_sub_parent_id']
             book = Book.query.get(parent)
             bb=QuickParentBook()
-            bb.parent.append( { 'id': parent, 'title': book.title } )
+            bb.parent= { 'id': parent, 'title': book.title }
             form.publisher.default = book.publisher
             form.owned.default = book.owned
             form.condition.default = book.condition