QGradient crashes using a non existing QGradient::Preset number

From the new feature in Qt5.12.2

• Added presets for QGradient based on https://webgradients.com/

 It crashes if we place direct a number that does not exist in QGradient::Preset enumarator.

          fillRect(0, 0, cx, cy, (QGradient::Preset) 0 );         (crashes here)

and between the published 1-180 in  https://webgradients.com/ 

missing numbers: 27,39,40,45,71,74,105,111,119,130,135,141