RSS error: PCDATA invalid Char value 8

when I update a blog, I found rss error:
This page contains the following errors:
error on line 455 at column 40: PCDATA invalid Char value 8
Below is a rendering of the page up to the first error.

I do not know whether hugo has regular filtering when generating rss。

It’s up to the user to decide if content needs to be sanitized before it is converted in an output format such as xml.

Hugo has a replaceRE function. See the Docs.