[Github-comments] [geany/geany] gtk_tree_model_get failed at begining loop (#2278)

[duanwujie]

This will  be failed in  first loop, **how to get first TAG ?**
		**gtk_tree_model_get(model, &iter, SYMBOLS_COLUMN_TAG, &tag, -1);**

``` 
static void on_update_all_index(GtkWidget *widget, gpointer user_data)
{

	GtkTreeIter iter;
    GeanyDocument * doc = document_get_current();
	gboolean cont = TRUE;
    gint line_num;
    gint index_chr = 0;

    GtkTreeStore  * store = doc->priv->tag_store;
	GtkTreeModel *model = GTK_TREE_MODEL(store);

    unsigned int * seg = 0;

    int count = 0;
	if (!gtk_tree_model_get_iter_first(model, &iter)){
		return;
    }
	do
	{
        TMTag * tag;
		gtk_tree_model_get(model, &iter, SYMBOLS_COLUMN_TAG, &tag, -1);
        if(!tag){
			cont = ui_tree_model_iter_any_next(model, &iter, TRUE);
        }else{
            line_num = tag->line;
#if 1
            if(line_num >= 0){
                index_chr++;
                //editor_udpate_chapter_index_quickly(doc->editor,index_chr,line_num);
            }
#endif
            tm_tag_unref(tag);
        }
	}
	while (gtk_tree_model_iter_next(model, &iter));
}
```

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