Box Plot Specifying outliers Apparent Bug

I am trying to draw two box plots next to each other where I’ve precomputed the fences, quartiles, and median. I may have outliers on one or both of these two box plots I want to draw. I pass points in the y field that I want to be plotted as outliers, but I’m finding that the whole plot doesn’t show up if the first plot has no outliers. I’ve made a fiddle to demonstrate:

The first two plots work, but the third one doesn’t because the first of the inner lists is empty.


  1. Is using y to specify precomputed outlier points the right thing to do? I didn’t see any other arguments about outliers.
  2. Is this a bug I should file as a Github issue?