Highcharts,js Column Chart Won't show negative values - highcharts

Question

Hi I am trying to make my column chart display negative values. I have looked through many examples and can't find a solution.
My code is shown below:
/***************************************************************
* container: chart_1_2
***************************************************************/
var chart_1_2_Options = {
chart: {
renderTo: 'chart_1_2',
backgroundColor: '#FFFFFF',
zoomType: 'x'
},
xAxis: {
type: 'datetime'
},
plotOptions: {
column: {
borderWidth: 0
},
series: {
pointWidth: 30,
stacking: 'normal'
}
},
legend: {
enabled: true
}
};
/**
* initialize the chart
*/
var chart_1_2 = new Highcharts.Chart(chart_1_2_Options);
chart_1_2.showLoading();
/**
* callback to be called from the bundled ajax calls
*/
function onChart_1_2_DataReceived(data) {
console.log(data);
/**
* do something with the data
*/
var seriesoptions = [
{
type: 'column',
lineWidth: 2,
states: {
hover: {
enabled: true,
lineWidth: 2
}
},
color: '#e25826',
name: 'Sales'
}
];
chart_1_2_Options.series = seriesoptions;
var chart_1_2 = new Highcharts.Chart(chart_1_2_Options);
chart_1_2.series[0].setData(data);
}
/***************************************************************
* end of chart_2_1
**************************************************************/
The array which is passed into the onChart_1_2_DataReceived() function is as follows:
As you can see the array contains positive and negative values, all of the positive values are displayed on the chart but all the negative values are displayed as 0's.
I am using highcharts version 5.0.7. I have tried setting the yAxis min to -50 and that doesn't make any difference either.