if (gtk_tree_selection_get_selected(GTK_TREE_SELECTION(sel), &model, &iter)) {
gtk_tree_model_get(model, &iter, LIST_ITEM, &value, -1);
if (gtk_tree_selection_get_selected(GTK_TREE_SELECTION(sel), &model, &iter)) {
gtk_tree_model_get(model, &iter, LIST_ITEM, &value, -1);