"theme" doesn't have the breakpoints

[jbek7]

I'm getting an undef error for theme.breakpoints.only("xs") - theme.breakpoints is undefined. I've my Admin is configured like this:

const myLayout = () => <Layout menu={TreeMenu} />;

 <ThemeProvider theme={myTheme}>
            <Admin
                dataProvider={props.dataProvider}
                authProvider={props.authProvider}
                theme={myTheme} 
                layout={myLayout}

And I get an error:

index.js:1 MUI: The `styles` argument provided is invalid.
You are providing a function without a theme in the context.
One of the parent elements needs to use a ThemeProvider. 
    at TreeMenu (http://localhost:8088/static/js/0.chunk.js:13537:25)
    at div
----


index.js:689 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'only')
    at push../node_modules/@bb-tech/ra-components/dist/index.js.styles.makeStyles.name (index.js:689:1)