diff -up gtk+-2.12.1/gtk/gtktreeview.c.system-log gtk+-2.12.1/gtk/gtktreeview.c
--- gtk+-2.12.1/gtk/gtktreeview.c.system-log	2007-10-18 21:51:23.000000000 -0400
+++ gtk+-2.12.1/gtk/gtktreeview.c	2007-10-18 21:53:18.000000000 -0400
@@ -13276,18 +13276,24 @@ gtk_tree_view_get_visible_range (GtkTree
 {
   GtkRBTree *tree;
   GtkRBNode *node;
-
+  gboolean retval;
+  
   g_return_val_if_fail (GTK_IS_TREE_VIEW (tree_view), FALSE);
 
   if (!tree_view->priv->tree)
     return FALSE;
 
+  retval = TRUE;
+
   if (start_path)
     {
       _gtk_rbtree_find_offset (tree_view->priv->tree,
                                TREE_WINDOW_Y_TO_RBTREE_Y (tree_view, 0),
                                &tree, &node);
-      *start_path = _gtk_tree_view_find_path (tree_view, tree, node);
+      if (tree)
+        *start_path = _gtk_tree_view_find_path (tree_view, tree, node);
+      else
+        retval = FALSE;
     }
 
   if (end_path)
@@ -13300,10 +13306,13 @@ gtk_tree_view_get_visible_range (GtkTree
         y = TREE_WINDOW_Y_TO_RBTREE_Y (tree_view, tree_view->priv->vadjustment->page_size) - 1;
 
       _gtk_rbtree_find_offset (tree_view->priv->tree, y, &tree, &node);
-      *end_path = _gtk_tree_view_find_path (tree_view, tree, node);
+      if (tree)
+        *end_path = _gtk_tree_view_find_path (tree_view, tree, node);
+      else
+        retval = FALSE;
     }
 
-  return TRUE;
+  return retval;
 }
 
 static void