Readability: Cannot read property 'trim' of null

[MrOrz]

When resolving http://web.tccf.org.tw/lib/addon.php?act=post&id=3178, such error message would occur:

[GET] http://web.tccf.org.tw/lib/addon.php?act=post&id=3178 - 22923 - 2605ms
[scrap][executor] http://web.tccf.org.tw/lib/addon.php?act=post&id=3178 - Error: Evaluation failed:TypeError: Cannot read property 'trim' of null
    at Readability.<anonymous> (__puppeteer_evaluation_script__:1225:36)
    at HTMLCollection.forEach (<anonymous>)
    at Readability._forEachNode (__puppeteer_evaluation_script__:215:29)
    at Readability._getArticleMetadata (__puppeteer_evaluation_script__:1210:10)
    at Readability.parse (__puppeteer_evaluation_script__:1790:25)
    at executor (__puppeteer_evaluation_script__:1829:36)
    at __puppeteer_evaluation_script__:1831:16
    at __puppeteer_evaluation_script__:1832:8

The error is caught properly and the fallback script do fetch some summary, though.