I'm trying to implement a heatmap in highcharts with a logarithmic colorAxis, however, I keep getting highcharts error [#10](https://www.highcharts.com/errors/10) (can't plot zero or subzero values on a logarithmic axis). 

As I'm trying to apply the logarithmic property to the color axis and not the actual axis themselves, I believe my problem is caused by some of my bins having a frequency of zero (A heatmap colors by the frequency in each bin). 

How can I get around this? Can I create a default function so that when a frequency is zero it assigns that bin a default color? I can't find any solutions in the docs.

Currently, my colorAxis object looks like this

```
colorAxis: {
  type: 'logarithmic',
  minColor: '#EEEEFF',
  maxColor: '#000022',
  stops: [
    [0, '#EFEFFF'],
    [0.67, '#4444FF'],
    [1, '#000022']
  ]
}

```