Please upgrade the version of Readability.js in chrome extension.
I constantly run into a bug on some sites, namely "washingtonpost.com", which has been fixed in https://github.com/mozilla/readability/commit/2333080231e62b5d1212058bf20ed8e1a7c62040
Thanks for reporting this! I've just updated Readability.js to the latest version. Please let me know if you notice any further issues!