The code is very standard chart example pulled straight from the docs. It is interesting that the error occurs using either the java method as well as html. In both cases a polymer template and modelrepository is used. Another thing to note is that the error is diplayed via UI in Firefox, but in Chrome, it is only shown in devTools->console
I was playing around with [chart’s demo]
(https://charts.demo.vaadin.com/), and I wasn’t able to reproduce the problem, which exact sample pulled straight from the docs is causing this?