Works with 3 data points but breaks on 2

[peterbe]

This works:

var DATA = [
        {y: '2011-04', a: 75, b: 50},
        {y: '2011-03', a: 75, b: 50},
        {y: '2011-02', a: 100, b: 75}];

$(function() {

// quarterly data, custom colors, skinny lines
Morris.Line({
  element: 'container',
  data: DATA,
  xkey: 'y',
  ykeys: ['a', 'b'],
  labels: CATEGORIES,
  //lineColors: ['#167f39','#044c29'],
  lineWidth: 2
});

This draws equally but when I hover over the graph I get an error::

var DATA = [
        // NOTICE how there's only 2 data points this time.
        {y: '2011-03', a: 75, b: 50},
        {y: '2011-02', a: 100, b: 75}];

$(function() {

// quarterly data, custom colors, skinny lines
Morris.Line({
  element: 'container',
  data: DATA,
  xkey: 'y',
  ykeys: ['a', 'b'],
  labels: CATEGORIES,
  //lineColors: ['#167f39','#044c29'],
  lineWidth: 2
});

The error is: z[b][a] is undefined

I'm going to try to find out what the error is in the not-compressed version.

[peterbe]

The error is:

[17:13:36.634] seriesPoints[i][index] is undefined @ http://aroundtheworld/static/lib/morris.js?v=7876c:225

Here's the relevant code:

        if (index !== null && prevHilight !== index) {
          for (i = 0, _ref10 = seriesPoints.length - 1; 0 <= _ref10 ? i <= _ref10 : i >= _ref10; 0 <$
(line 225)            seriesPoints[i][index].animate(pointGrow);
          }
          updateHover(index);
        }
        prevHilight = index;
        if (index === null) return hideHover();

[oesmith]

Should be fixed now in master. A nuance in the implementation got missed when I translated to coffeescript. Schoolboy error on my part!