JS error in console while selecting the color

Problem/Motivation

When color is selected & clicked on Save button on picker, it shows js error in console. The error is: Uncaught ReferenceError: NULL is not defined.

Steps to reproduce

Add Color Pickr field to entity & go to add form.
Then choose a color & click on Save button on picker.
The js error is shown in console.

Proposed resolution

Fix the error in js code.