Webworkify-webpack v2.1.5 config for node_modules dependency Cannot read property 'call' of undefined

[ioedeveloper]

Hi,
I can't get webworkify-webpack working for a node_module dependency that uses webworkify v^1.2.1 and uses the require('./worker') rather than require.resolve('./worker') for v2.1.5
Here is my webpack.config.js.

module.exports = {
  entry: {
    app: ['./example/main.js']
  },
  output: {
    filename: 'output.js',
    pathinfo: true
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['es2015']
            }
          }
        ]
      }
    ]
  },
  resolve: {
      alias: {
          'webworkify': 'webworkify-webpack'
      }
  },
  plugins: [
    new webpack.NamedModulesPlugin()
  ]
}

How can i get it working with my dependency without having to alter my dependency code? Thanks, your help is greatly appreciated!