The issue is that you can't successfully download required player data. Your version of Chrome doesn't seem to support XMLHttpRequest.reponseText, however https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#Browser_compatibility
says that it should.
Note: In some versions of Chrome, you may not be able to remove players from the Blocklist or threads from Hidden Threads and Thread Exceptions. Resetting the script's settings also won't correctly work, however I know ways around setting storage issues. This is a listed bug in Chrome - https://bugs.chromium.org/p/chromium/issues/detail?id=765524
Edit: due to when the player data was downloaded in comparrison of when you encountered the bug, I thought the bug was to do with player data not being downloaded. Turns out that the bug was to do with script storage data being read before it was defined (I.E. first time-only).
Edited 4/17/2018 19:35:31