[Bug]: adding css variables as style manager property

trying to add css variable to style manager causing error: Uncaught TypeError: Cannot read property 'toUpperCase' of undefined fiddle

editor.StyleManager.addSector('test', {
  name: 'My Vars',
  open: true,
  properties: [{
    type: 'integer',
    property: '--my-var',
  }],
})

Am i doing something wrong?

Fixed by changing utils/mixins.js#L76 to

const camelCase = value => {
  const values = value.split('-').filter(v=>!!v);