How to nest the traversal method in the data obtained by cheerio?

the small crawler written by node reported an error when it was written to parse the crawled data with cheerio, saying that it was a problem of circular invocation. Paste code:

    $("-sharplive-list-contentbox>li").each((i, ele) => {
        let _this = $(ele);
        rooms.push({
            title: _this.find(".play-list-link").attr("title"),
            author: _this.find(".dy-name").text(),
            room_num: _this.find(".play-list-link").attr("href").replace(/\//g, ""),
            room_label: _this.find(".impress-tag-item").map((i, ele) => {
                return $(this).text()
            })
        });
    });

the outermost each above is each li,. I want to put a few crawled text tags in the room_label, and then I want to use map to traverse an array, only to report an error. It is said that it is a circular call. If the map is removed, it can work normally. I would like to ask why the traversal method can not be used in such nesting?

error figure: