Uncaught SyntaxError: Failed to execute 'querySelector' on 'Document': '#-5' is not a valid selector.

View details in Rollbar: [https://app.rollbar.com/a/komagata/fix/item/Bootcamp/1775](https://app.rollbar.com/a/komagata/fix/item/Bootcamp/1775)

```

SyntaxError: Failed to execute 'querySelector' on 'Document': '#-5' is not a valid selector.
  File "https://bootcamp.fjord.jp/packs/js/application-e68b90f5ad58ecab3ecf.js", line 2, in [anonymous]
```