Google gets Unable to find native implementation, or alternative implementation for WebSocket!

Crawling pages with google webmaster tools shows
`Unable to find native implementation, or alternative implementation for WebSocket!` as a console error, and page is just blank.

wsClient is created with
```
import { createApolloClient } from 'vue-cli-plugin-apollo/graphql-client';
const { apolloClient, wsClient } = createApolloClient({
...defaultOptions
});
apolloClient.wsClient = wsClient;
```