TypeScript:optionals

{
  "stack": "<stack trace above>",
  "name": "Error",
  "message": "Evaluation failed: TypeError: Cannot read property 'defaultValue' of undefined\n    at https://5a375b97f4b14f0020b0cda3-wecdjwgsge.chromatic.com/main.8c029374a86387a17f36.bundle.js:1:2329283\n    at eval (webpack://storybook_docs_dll//tmp/storybook/node_modules/lodash/mapValues.js?:38:34)\n    at eval (webpack://storybook_docs_dll//tmp/storybook/node_modules/lodash/_createBaseFor.js?:18:11)\n    at baseForOwn (webpack://storybook_docs_dll//tmp/storybook/node_modules/lodash/_baseForOwn.js?:14:20)\n    at mapValues (webpack://storybook_docs_dll//tmp/storybook/node_modules/lodash/mapValues.js?:37:3)\n    at ArgsStory (https://5a375b97f4b14f0020b0cda3-wecdjwgsge.chromatic.com/main.8c029374a86387a17f36.bundle.js:1:2329243)\n    at renderWithHooks (webpack://storybook_docs_dll//tmp/storybook/node_modules/react-dom/cjs/react-dom.development.js?:2546:153)\n    at mountIndeterminateComponent (webpack://storybook_docs_dll//tmp/storybook/node_modules/react-dom/cjs/react-dom.development.js?:2831:885)\n    at beginWork (webpack://storybook_docs_dll//tmp/storybook/node_modules/react-dom/cjs/react-dom.development.js?:3049:101)\n    at HTMLUnknownElement.callCallback (webpack://storybook_docs_dll//tmp/storybook/node_modules/react-dom/cjs/react-dom.development.js?:70:102)"
}