And if it get's in your history, it'll crash every time the character shows up again. I ended up having to delete the entry manually:

  $ sqlite3 ~/Library/Safari/History.db
  SQLite version 3.19.3 2017-06-27 16:40:08
  Enter ".help" for usage hints.
  sqlite> delete from history_items where url = "https://pastebin.com/9Tr8ytTr";