There is a bug in highcharts 4.2.2 which causes an error to be thrown in the console after hovering over a point (or column, or part of a pie chart, etc...). This is fixed in the master branch of highcharts right now, but a release hasn't been put out to fix it.
There is a bug in highcharts 4.2.2 which causes an error to be thrown in the console after hovering over a point (or column, or part of a pie chart, etc...). This is fixed in the master branch of highcharts right now, but a release hasn't been put out to fix it.