Error: Editor's content can not be saved in read-only mode

I'm using EditorJS as my rich text editor, but I'm using readOnly option, as I don't want the user to edit what is written unless he press on a specific button.
So whenever the user start to edit it and try to save it, I got this `Error: Editor's content can not be saved in read-only mode`

read-only option is mentioned in the [documentation here](https://editorjs.io/tools-api), but it doesn't mention how to use it !
So Am I using read-only wrongly, or it should be set in other way?
If yes, how to enable read-only mode for tools.

This is what I'm using:
```
import Header from '@editorjs/header';
import Paragraph from '@editorjs/paragraph'

const RichGuidelinesEditor = ({ value, onChange, isReadOnly }) => {
const EDITOR_JS_TOOLS = {
paragraph: {
class: Paragraph,
inlineToolbar: true,
readOnly: true,
},
header: {
class: Header,
readOnly: true,
},
}

const handleOnChange = e => { e.saver.save().then(res => { onChange(res.blocks); }

return(
args[0]}
/>
)
}
export default RichGuidelinesEditor;
```

Browser: Chrome.
OS: Windows 10.

Editor.js version: Latest version.

Plugins: "[react-editor-js](https://www.npmjs.com/package/react-editor-js)"