Node.js can'；“找不到下一步”按钮以导航到其他页面

我正在使用Puppeter从cluth.co这样的网站上获取一些URL 下面是函数get some URL和next按钮的代码：

async function scrapeCurrentPage(){
        await page.waitForSelector(container)
        //get all the link on page
        let urls = await page.$$eval(detail, links => {
            links = links.map(el => el.href)
            return links
        })
        for(link in urls){
            let currentPageData = urls[link]
            scrapedData.push(currentPageData)
        }
        //next button
        let nextButtonExist = false
        try{
            const nextButton = await page.$eval(next_btn, a => a.textContent)
            nextButtonExist = true 
        }
        catch(err){
            nextButtonExist = false
        }
        if(nextButtonExist){
            count++
            await page.click(next_btn)
            console.log(`Navigating to page ${count+1}`)
            return scrapeCurrentPage()
        }
        await page.close()
        return scrapedData
    }

但当运行时，有时它可以继续转到第10页或更多页，有时它只能转到第2页然后完成运行 有人知道为什么吗