Steps to reproduce:
1. Wrote a simple programs GTK+/C that uses GtkTreeView widget.  
2. The applications that I developed contains two GtkTreeView widgets(one in the left and another in the right). In between these two widgets there are two buttons - Forward and Backward. If forward button is clicked the selected item from the left tree should move to the right tree and vice-versa.
3. If accessibility support is not enabled it works properly, but if accesssibility support is enabled the application quits, showing the following error message: 

** ERROR **: file gailtreeview.c: line 3755 (traverse_cells): assertion failed: (row_path != NULL)
aborting...
Aborted



Stack trace:
void forward_button_clicked(GtkWidget *widget,gpointer data)
{
  model=gtk_tree_view_get_model(GTK_TREE_VIEW(available_treeview));
     
  if(gtk_tree_selection_get_selected(sel, &model, &iter))
  //if(gtk_tree_selection_get_selected(sel, &available_liststore, &iter))  
  {
    gchar *names; 
    gtk_list_store_append(selected_liststore,&iter1);
    gtk_tree_model_get(GTK_TREE_MODEL(available_liststore), &iter, 0, &names, -1);
    gtk_list_store_set(selected_liststore, &iter1,0, names,-1);
    gtk_list_store_remove(GTK_LIST_STORE(model), &iter);
  } 
  else
  {
    gtk_widget_set_sensitive(GTK_WIDGET(forward_button),FALSE);
  }
  gtk_tree_view_set_model(GTK_TREE_VIEW(selected_treeview),GTK_TREE_MODEL(selected_liststore));
}

Other information: