Cannot read property 'thisCompilation' of undefined

[wearefridayhutber]

I have just moved react-scripts@1.1.15 to react-scripts-cssmodules and now when running npm run build

Cannot read property 'thisCompilation' of undefined

Package.json

{
  "name": "aviva_penny",
  "version": "1.0.0",
  "private": true,
  "homepage": "http://--DOMAIN--/",
  "repository": {
    "type": "git",
    "url": "https://github.com/AvivaPenny/cloud"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "CI=true react-scripts test --env=jsdom  --colors",
    "report": "CI=true react-scripts test --env=jsdom  --colors --coverage",
    "test:watch": "react-scripts test --env=jsdom",
    "lint-scripts": "eslint './{src/**,test/**,config/**,.}/*.js'",
    "lint-styles": "stylelint './src/**/*.css'",
    "lint": "npm run lint-scripts && npm run lint-styles",
    "postversion": "git push && git push --tags && npm publish",
    "preversion": "npm run lint && npm run test && npm run build",
    "commit": "git-cz",
    "storybook": "start-storybook -p 9009 -s public",
    "build-storybook": "build-storybook -s public",
    "prepush": "npm run test",
    "eject": "react-scripts eject",
    "mock-server": "./node_modules/.bin/json-server --watch ./src/mock-server/db.json --port 3001 --routes ./src/mock-server/routes.js"
  },
  "lint-staged": {
    "*.js": [
      "prettier --write",
      "eslint",
      "git add"
    ],
    "*.css": [
      "stylelint --fix",
      "git add"
    ]
  },
  "husky": {
    "hooks": {
      "pre-commit": "lint-staged"
    }
  },
  "dependencies": {
    "bootstrap": "^4.1.2",
    "connected-react-router": "^4.4.1",
    "eslint-plugin-react-app": "^3.0.0",
    "history": "^4.7.2",
    "jest-fetch-mock": "^1.6.5",
    "numeral": "^2.0.6",
    "react": "^16.4.1",
    "react-dom": "^16.4.1",
    "redux-form": "^7.4.2"
  },
  "devDependencies": {
    "@babel/core": "^7.1.0",
    "@babel/runtime": "^7.0.0",
    "@material-ui/core": "^3.0.1",
    "@material-ui/icons": "^3.0.1",
    "@storybook/addon-actions": "^4.0.0-alpha.21",
    "@storybook/addon-info": "^4.0.0-alpha.21",
    "@storybook/addon-links": "^4.0.0-alpha.21",
    "@storybook/addons": "^4.0.0-alpha.21",
    "@storybook/react": "^4.0.0-alpha.21",
    "babel-core": "^6.26.3",
    "babel-eslint": "^7.2.3",
    "babel-runtime": "^6.26.0",
    "cz-conventional-changelog": "^2.1.0",
    "enzyme": "^3.6.0",
    "enzyme-adapter-react-16": "^1.5.0",
    "enzyme-to-json": "^3.3.4",
    "eslint": "^4.9.1",
    "eslint-config-prettier": "^3.0.1",
    "eslint-plugin-jsx-a11y": "^5.1.1",
    "eslint-plugin-prettier": "^2.6.2",
    "husky": "^1.0.0-rc.14",
    "json-server": "^0.14.0",
    "lint-staged": "^7.2.2",
    "prettier": "^1.14.2",
    "prop-types": "^15.6.2",
    "react-hot-loader": "^4.3.5",
    "react-redux": "^5.0.7",
    "react-router": "^4.3.1",
    "react-router-dom": "^4.3.1",
    "react-scripts-cssmodules": "^1.1.50",
    "react-test-renderer": "^16.4.2",
    "redux": "^4.0.0",
    "redux-devtools-extension": "^2.13.5",
    "redux-logger": "^3.0.6",
    "redux-persist": "^5.10.0",
    "redux-thunk": "^2.3.0",
    "stylelint": "^9.5.0",
    "stylelint-config-standard": "^18.2.0"
  },
  "config": {
    "commitizen": {
      "path": "./websites/www/node_modules/cz-conventional-changelog"
    }
  },
  "browserslist": {
    "development": [
      "last 2 chrome versions",
      "last 2 firefox versions",
      "last 2 edge versions"
    ],
    "production": [
      ">0.25%",
      "not op_mini all",
      "ie 11"
    ]
  },
  "snapshotSerializers": [
    "enzyme-to-json/serializer"
  ]
}

[ro-savage]

@wearefridayhutber - Are you able to create a minimal repo with this issue?