Behavior change between version 0.1.1 and 0.2.0

[Midnighter]

Hi, I know that 0.1.1 is quite outdated but I was trying to run an old analysis and ran into a problem with the newer versions. It's a grouped data set and some groups may contain between 0-N data points. In 0.1.1 it plots just fine but when I upgrade I get the following message:

Warning messages:
1: In regularize.values(x, y, ties, missing(ties)) :
  collapsing to unique 'x' values
2: Computation failed in `stat_sina()`:
need at least two non-NA values to interpolate 

Does this tell you already how I would have to adjust my code in order to get the sina layer to draw?