Getting RangeError: Maximum call stack size exceeded

[santhoshmp89]

Describe the bug
After upgrading to v6. When run yarn test -u i am getting below error.

RangeError: Maximum call stack size exceeded

  at node_modules/@storybook/addon-knobs/dist/KnobManager.js:84:17
      at Array.reduce (<anonymous>)
  at escapeStrings (node_modules/@storybook/addon-knobs/dist/KnobManager.js:83:30)
  at node_modules/@storybook/addon-knobs/dist/KnobManager.js:88:20
      at Array.reduce (<anonymous>)

Here is my story component:

export const Default = () => {
const children = (

This is a child i think. The hope is that by me typing with a ton of new lines that i'll bring up the custom
Scrollbar Do you see it? I'm not sure yet so i'm going to keep typing. Don't judge this stream of typing

);

return (
    <Scrollbar
        width={number('Width', 150)}
        height={number('Height', 120)}
        className={text('css classes', '')}
        children={object('Child node', children)}
        autoHide={boolean('Auto hide', false)}
    />
);

};