Non-breaking MUI theme error on Create Form load in browser console

[andrii-i]

Description

When create form is loaded, error below is seen in the browser console (reproduced on Firefox, Chrome). Seems to be related to our theming code but colors look fine

Uncaught (in promise) Error: MUI: Unsupported `` color.
The following formats are supported: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color().

Reproduce

1. Load create form
2. Open browser console and note errors

Expected behavior

No errors displayed