apollo client:download-schema reports error

My apollo.config.js is
```
module.exports = {
client: {
service: {
name: 'Public API',
url: 'DoesNotMatter',
skipSSLValidation: true
}
}
}
```
and when I run `apollo client:download-schema schema.json` it returns:
```
CLIError: Error in "Loading queries for Public API": Error: ️️There are multiple definitions for the `apiFields` operation. Please rename or remove all operations with the d
uplicated name before continuing.
at Object.error (C:\Data\Work\Zasilkovna\repo\ui\node_modules\@oclif\errors\lib\index.js:22:17)
at SchemaDownload.error (C:\Data\Work\Zasilkovna\repo\ui\node_modules\apollo\node_modules\@oclif\command\lib\command.js:57:23)
at OclifLoadingHandler.showError (C:\Data\Work\Zasilkovna\repo\ui\node_modules\apollo\lib\OclifLoadingHandler.js:28:22)
at OclifLoadingHandler.handle (C:\Data\Work\Zasilkovna\repo\ui\node_modules\apollo\lib\OclifLoadingHandler.js:13:18) {
oclif: { exit: 2 },
code: undefined
}
```

Even when URL is not defined in config, it throws same error. But without this file it is not working. Does it looks to another configuration as well? Or where is problem?

Start with apollo.config.js and the `apollo client:download-schema schema.json` command, then inspect the reported `SchemaDownload` and `OclifLoadingHandler` stack entries. Reproduce the duplicate `apiFields` error with and without the configuration file; done means identifying which configuration or query source causes the error and documenting the confirmed fix.

Written by the indexing model from the issue text.