debugging domjs and highcharts
It's not possible for me to easily reproduce the issue, but here are some leads you might want to follow:
Highchart issue #1300:
Fixed error on exporting an empty chart due to labels with y attribute of NaN
There was some discussion about it on the Highsoft Forum.
This issue has been fixed in 2.3.5 as reported on their changelog.
It appears to be a warning when null data is received in most cases, so are you sure this data is returned? Maybe your chart is loaded before your object data is returned? I'm just thinking out loud.
This is not a solution, just a tip.
I think that you need to break this problem into a smaller one, make it work and increase it carefully. Them you will get where the thing is breaking your legs. Start fresh and redoo until you find the problem.