Firefly throwing Uncaught TypeErrors

[dnephin]

Graph #!8TG. Chrome 27.0.1453.65 beta (linux). I am connecting over a VPN, so it may be related to a slow network.

I get a couple dozen of these:

Uncaught TypeError: Cannot read property 'y' of undefined renderer_worker.js:259

There are 2 graphs on the page. The graphs kind of half work. If i refresh sometime I will get one or the other, rarely both, and then usually the errors start.