Error when using a material ui theme where a default prop is overwritten with a component

[danhorvath]

Defining components as default props in a material ui theme throws the following error:

Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
    at createFiberFromTypeAndProps (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:253875:21)
    at createFiberFromElement (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:253898:15)
    at createChild (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:243538:28)
    at reconcileChildrenArray (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:243810:25)
    at reconcileChildFibers (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:244215:14)
    at reconcileChildren (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:246672:28)
    at updateHostComponent (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:247212:3)
    at beginWork (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:248537:14)
    at HTMLUnknownElement.callCallback (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:230098:14)
    at Object.invokeGuardedCallbackDev (http://localhost:9009/vendors~main.e20e507f310929fd7c90.bundle.js:230147:16)

This error can be reproduced in the demo app (https://github.com/react-theming/theming-material-ui) by extending the example theme like this:

export const theme1 = createMuiTheme({
  // ...
  props:{
    MuiCheckbox:{
      icon:<CheckCircle/>
    }
  }
});

This error happens both with material ui v4 and v5.

[usulpro]

Hey @danhorvath passing React components to the addon panel isn't supported. But as I see it's already solved in the neighbor issue