[2692] why customize bundle filename occur error in nuxt dev mode?

build and start, it is fine. but when 'npm run dev', following error occurred.

[nuxt] Error while initializing app TypeError: Cannot read property 'call' of undefined
      at o (manifest.app.js:1)
      at <anonymous>

a few hours later, i found customize bundle filenames was crushing nuxt dev mode

in nuxt.config.js

module.exports = {
         filenames: {
               manifest: 'manifest.app.js',
               vendor: 'vendor.app.js',
               app: 'app.app.js'
          }
}

when remove filenames field, development mode work fine. but i don't know why......