@ -421,7 +421,11 @@ static void DrawValueNode(Graphviz *const graph_obj, const ValueNodePtr &node) {
graph_obj->buffer() << "<br/>";
}
graph_obj->buffer() << attr.first << " ";
graph_obj->buffer() << attr.second->ToString();
if (attr.second == nullptr) {
graph_obj->buffer() << " ";
} else {
i++;