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List:       qgis-developer
Subject:    Re: [QGIS-Developer] NULL in field
From:       Andrea Giudiceandrea <andreaerdna () libero ! it>
Date:       2021-03-30 11:49:31
Message-ID: 1617104971913-0.post () n6 ! nabble ! com
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Giulio Fattori wrote
> @qgsfunction(args='auto', group='Custom')

Hi Giulio,
AFAIK you should add handlesnull=True to the function decorator in order to
properly handle parameter's NULL values in the function

@qgsfunction(args='auto', group='Custom', handlesnull=True)

See: https://qgis.org/pyqgis/master/core/qgsfunction.html#module-qgsfunction

Best regards.

Andrea



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