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TL；DR assertion 'VALID_ITER (parent, tree_store)' failed：。我如何解决它？

我已经使用以下（修剪过的）代码在我的应用程序中成功显示了 GtkTreeView：

enum { DISPLAY_COLUMN, N_COLUMNS };
GValue comment = G_VALUE_INIT;
GValue amount = G_VALUE_INIT;

GtkTreeIter toplevel, child;
GtkTreeStore *treestore = gtk_tree_store_new(N_COLUMNS, G_TYPE_STRING);

for(int step = 0; step < recipe_count; step++) {
    g_value_init(&comment, G_TYPE_STRING);
    g_value_set_string(&comment, recipe[step].comment);
    gtk_tree_store_append(treestore, &toplevel, NULL);
    gtk_tree_store_set_value(treestore, &toplevel,
        COMMENT_COLUMN, &comment
    );

    g_value_init(&amount, G_TYPE_STRING);
    g_value_set_string(&amount, recipe[step].amount);
    gtk_tree_store_append(treestore, &toplevel, &child);
    gtk_tree_store_set_value(treestore, &toplevel,
       COMMENT_COLUMN, &amount
    );

    g_value_unset(&amount);
    g_value_unset(&comment);
}

gtk_tree_view_set_model(GTK_TREE_VIEW(app->step_tree),GTK_TREE_MODEL(treestore));

GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes ("Step",
                                    renderer,
                                    "text", DISPLAY_COLUMN,
                                    NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW(app->step_tree), column);

以上所有内容都包含在一个函数中，以便稍后我可以再次加载新数据。但是，我第二次尝试

(recipe_editor:11451): Gtk-CRITICAL **: IA__gtk_tree_store_append: assertion `VALID_ITER (parent, tree_store)' failed
(recipe_editor:11451): Gtk-CRITICAL **: IA__gtk_tree_store_set_value: assertion `VALID_ITER (iter, tree_store)' failed

我知道这意味着我的迭代器有问题，但我不确定如何实际修复它。

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