Jetpack: Masterbar: Site link from wp-admin is undefined

[beaulebens]

Steps to reproduce the issue

1. Enable the WP.com toolbar (masterbar)
2. Go to any page in wp-admin
3. Click "My Sites" in the top-left
4. Click the SiteIcon or label of the site at the top of the menu to visit the site (correct URL is shown in the browser status bar)
5. Instead, land on /wp-admin/undefined

Note that clicking the same icon/link from the frontend of the site works correctly, and returns you to the homepage of the site.

cc @vindl

[jeherve]

For reference, this site runs 5.6-alpha.

[vindl]

@rodrigoi any chance your latest analytics changes to Masterbar could have caused this?

[rodrigoi]

@vindl yep. Working on a fix right now.