The fix in #445 causes an uncaught promise rejection in Chrome.

Chrome Version: 53.0.2785.116 (64-bit)

Reproduction:

1. Go to http://plnkr.co/edit/UwHURsu8rchPkTXoveTZ?p=preview
2. Open up Chrome Dev Tools
3. Refresh the page

Expected:

Page refreshes without error

Actual:

Page refresh is caught by uncaught rejection: