thoughtbot/capybara-webkit — comment on commit 62b49914b8a19e2f6f041ed83ae368b11066b4b8
File:  line 0
By adsummos:

There seems to be a race condition somewhere. Sometimes I get
|15|TypeError: Result of expression 'b' [undefined] is not an object.
in the console running my tests, but nothing ends up in console_messages. Other times it does end up there.