Ignore Null values from the database ConsoleTvs Charts

So I have a set of data that needs to be displayed on the admin dashboard. I decided to use laravel charting package ConsoleTvs Charts by Erik Campobadal.

I am using the package above to create charts directly from the database, the issue is, within my table (user's table for example) there are columns with NULL value.

How do I ignore this null values and represent only columns with real values on my chart?

`
 $chart_print_media = Charts::database(User::all(), 'pie', 'highcharts')
                ->title('Print Media Campaign')
                ->dimensions(450, 300)
                ->groupBy('print_media',null);`

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