[Wikidata-l] unexpected error info in HTML

Hi,

I noticed some pages we crawled containing error message like this;

<div id="mw-content-text" lang="zh-CN" dir="ltr" class="mw-content-ltr"><p class="error">Failed to render property P373: Wikibase\LanguageWithConversion::factory: given languages do not have the same parent language</p>

But when I open the url in browser, there is no such message. And using index.php can also get normal content without error messages.

Here are examples you can retry:

bad $ wget 'http://zh.wikipedia.org/zh-cn/Google'

good $ wget 'http://zh.wikipedia.org/w/index.php?title=Google'

Looks like something is wrong on Wikipedia side, anything need to fix?

Thanks