Prisma

If I add this query to my `schema.graphql`, `graphql codegen -p app` fails with error: `UnhandledPromiseRejectionWarning: Error: TypeError: Cannot read property 'type' of undefined`
```
search(id: ID!, radius: Int!): [Apartment!]!
```

It seems it has a problem with the array because if I change the line to this (everything else remains the same), it works:
```
search(id: ID!, radius: Int!): Apartment!
```

Any suggestions?

(edit: the graphql server works perfectly with both versions, only the `graphql codegen` command fails)