Index: src/wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-posts-list-table.php	(revision 49491)
+++ src/wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -1681,6 +1681,7 @@
 								'post_type'         => $post_type_object->name,
 								'selected'          => $post->post_parent,
 								'name'              => 'post_parent',
+								'id'                => $bulk ? 'bulk-edit-post-parent' : 'inline-edit-post-parent',
 								'show_option_none'  => __( 'Main Page (no parent)' ),
 								'option_none_value' => 0,
 								'sort_column'       => 'menu_order, post_title',