Prerender- state undefined Is this error message?

[kidqn]

I run npm run build:universal, it builds Ok with status successful.
But I see there is a command npm run generate:prerender
It logs:

node prerender.js
state undefined
action { type: '@ngrx/store/init' }
state { router: undefined,
  auth: 
   { userId: null,
     username: null},
  match: 
   { ids: [],

is it error or not? Or I do prerender correctly or not?
Thanks for any helps. :)