errored out during transformation TypeError: /PROJECT/pages/404.js: Cannot read property 'constant' of undefined

Hi there 👋

I ran into this issue when adding optimize-plugin to my nextjs project.

```sh
$ next build
> [PWA] PWA support is disabled
> [PWA] PWA support is disabled
info - Using external babel configuration from /PROJECT/.babelrc
[OptimizePlugin] Detected core-js version 3
[OptimizePlugin] Completed in 4ms.
4ms: Optimize Assets
No polyfills bundle was created.
[OptimizePlugin] Completed in 1ms.
1ms: Optimize Assets
No polyfills bundle was created.
errored out during transformation TypeError: /PROJECT/pages/404.js: Cannot read property 'constant' of undefined
at PluginPass.FunctionExpression|FunctionDeclaration (/PROJECT/node_modules/babel-preset-modernize/dist/plugins/transform-iife-arrows/index.js:1:424)
at newFn (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/visitors.js:175:21)
at NodePath._call (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/path/context.js:55:20)
at NodePath.call (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/path/context.js:42:17)
at NodePath.visit (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/path/context.js:92:31)
at TraversalContext.visitQueue (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/context.js:115:16)
at TraversalContext.visitMultiple (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/context.js:79:17)
at TraversalContext.visit (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/context.js:141:19)
at Function.traverse.node (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/index.js:82:17)
at NodePath.visit (/PROJECT/node_modules/optimize-plugin/node_modules/@babel/traverse/lib/path/context.js:99:18) {
type: 'TypeError',
code: 'BABEL_TRANSFORM_ERROR'
}
info - Creating an optimized production build
Failed to compile.

TypeError: /PROJECT/pages/404.js: Cannot read property 'constant' of undefined

> Build error occurred
Error: > Build failed because of webpack errors
at build (/PROJECT/node_modules/next/dist/build/index.js:15:918)
at runMicrotasks ()
```

`babel.rc`
```sh
{
"env": {
"development": {
"presets": ["next/babel", "@emotion/babel-preset-css-prop"],
"plugins": ["@emotion", "date-fns", "transform-react-remove-prop-types"]
},
"production": {
"presets": ["next/babel", "@emotion/babel-preset-css-prop"],
"plugins": ["@emotion", "date-fns", "transform-react-remove-prop-types"]
}
}
}
```

`package.json`
```json
"dependencies": {
"@apollo/react-hooks": "^3.1.5",
"@apollo/react-ssr": "^3.1.5",
"@charlietango/use-focus-trap": "^1.2.10",
"@cometchat-pro/chat": "2.0.10",
"@emotion/babel-plugin": "^11.0.0",
"@emotion/babel-preset-css-prop": "^11.0.0",
"@emotion/react": "^11.1.1",
"@emotion/styled": "^11.0.0",
"@next/bundle-analyzer": "^10.0.3",
"@popmotion/popcorn": "^0.4.4",
"@types/node": "^14.0.1",
"@types/react": "^16.9.35",
"apollo-cache-inmemory": "^1.6.6",
"apollo-client": "^2.6.9",
"apollo-link-context": "^1.0.20",
"apollo-link-http": "^1.5.17",
"apollo-upload-client": "^13.0.0",
"cloudinary-core": "^2.8.2",
"cron": "^1.8.2",
"date-fns": "^2.13.0",
"dotenv": "^8.2.0",
"express": "^4.17.1",
"framer-motion": "^1.10.3",
"graphql": "^15.0.0",
"graphql-tag": "^2.10.3",
"helmet": "^4.2.0",
"intersection-observer": "^0.12.0",
"isomorphic-unfetch": "^3.0.0",
"js-cookie": "^2.2.1",
"mapbox-gl": "^2.0.0",
"next": "^10.0.3",
"next-cookies": "^2.0.3",
"next-fonts": "^1.1.0",
"next-i18next": "^7.0.1",
"next-pwa": "^3.1.5",
"node-cron": "^2.0.3",
"query-string": "^6.12.1",
"react": "^17.0.1",
"react-beautiful-dnd": "^13.0.0",
"react-date-range": "^1.0.3",
"react-dom": "^17.0.1",
"react-dropzone": "^11.0.1",
"react-html-parser": "^2.0.2",
"react-intersection-observer": "^8.26.2",
"react-select": "^3.1.0",
"typescript": "^3.9.2",
"use-media": "^1.4.0"
},
"devDependencies": {
"@babel/core": "^7.12.9",
"@testing-library/cypress": "^6.0.0",
"@typescript-eslint/eslint-plugin": "^2.33.0",
"@typescript-eslint/parser": "^2.33.0",
"babel-plugin-date-fns": "^2.0.0",
"babel-plugin-jsx-remove-data-test-id": "^2.1.3",
"babel-plugin-transform-react-remove-prop-types": "^0.4.24",
"cypress": "^4.5.0",
"cypress-file-upload": "^4.0.6",
"duplicate-package-checker-webpack-plugin": "^3.0.0",
"eslint": "^7.0.0",
"eslint-config-prettier": "^6.11.0",
"eslint-plugin-prettier": "^3.1.3",
"eslint-plugin-react": "^7.20.0",
"optimize-plugin": "^1.0.0",
"prettier": "^2.0.5",
"webpackbar": "^4.0.0"
}
```

`next.config.js`
```js
webpack: config => {
config.plugins.push(new OptimizePlugin());

return config;
},
```

Any idea?