Highcharts Pie chart - 2d array as series - charts

I am using Highcharts to draw some charts, including a pie one. The data needed to draw it are passed as an array, like this
data: [pieSeries]
The pieSieries array is a 2d array, and when I console.debug it this is the result:
Now the problem is that the data are not for some reason the chart is not drawn, there is just one line as in the following picture:
Any idea of why this is happening?
Thanks!

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