Theme manager advanced variable gives error on theme create

[pixlapps]

Wappler Version : 5.3.3
Operating System : Mac OSX
Server Model: node.js
Database Type: mariadb
Hosting Type: local - docker

Expected behavior

Added Variable should save as others do.

Actual behavior

What actually happens?
I get this error and theme is not created

How to reproduce

Add Advanced variable for fonts - size-sm and change or even keep the same. The error happens on both.

[Teodor]

Well when your size sm is using the font-size-base variable, then you also need to define it (add it) in the theme manager.