this.fire is not a function, only occurs when Google +1 button is on the page

[WillDonohoe]

Hey guys,

A very unusual bug here. When attaching the google feeds element to the page, I get the following error:

Uncaught TypeError: this.fire is not a function - google-feeds.html:150.

This error only occurs when the Google +1 button is added to the page. See my JS bin example. It logs out the feed to the console. Try deleting the button markup, and notice the error no longer occurs.

The error points to this line: https://github.com/GoogleWebComponents/google-feeds/blob/master/google-feeds.html#L150

From a first glance, it looks like this is out of scope, and can be easily resolved by adding .bind(this) to the end of the enclosing method. But it's puzzling why this would be fired when a +1 button is added.

Can anybody share any insight?

Thanks

[ebidel]

@addyosmani can you take a look?