Index: gtk+2.0-2.12.0/gtk/gtknotebook.c
===================================================================
--- gtk+2.0-2.12.0.orig/gtk/gtknotebook.c	2007-10-25 13:30:54.000000000 +0200
+++ gtk+2.0-2.12.0/gtk/gtknotebook.c	2007-10-25 13:32:37.000000000 +0200
@@ -2805,7 +2805,7 @@
   priv = GTK_NOTEBOOK_GET_PRIVATE (notebook);
   page = notebook->cur_page;
 
-  if (!priv->during_detach &&
+  if (!(priv && page) || !priv->during_detach &&
       page->reorderable &&
       event->button == priv->pressed_button)
     gtk_notebook_stop_reorder (notebook);