HotChocolate GraphQL error when child-list is null

given this query

{
  name,
  userList {
    firstName,
    lastName
  }
}

if userList (which is a list) is null for one object out of hundreds, I end up with this error
Value cannot be null. (Parameter 'source').
Shouldn’t the GraphQL engine detect the null and just ignore it?

I’ve tried making the userList property nullable, but that doesn’t help.