jqPlot fails when plotting certain decimal values?

Experts,

I am using jqPlot to make simple trend charts.

I've found that when plotting certain decimal points jqPlot fails and does not render the chart correctly?

Here is a fiddle to show you the failure: https://jsfiddle.net/bdbarrera/ocj5awef/

What's odd is that certain decimals like "37.25" are OK to plot where as "51.50" is causes the chart to fail.

FireBug reports the following error within the "jqplot.pointLabels.js" file:

TypeError: this[ax]._ticks[0] is undefined
p.formatString = this[ax]._ticks[0].formatString;