Apollo query using "... on MyNode" returns undefined.

[krailler]

Intended outcome:
{ data: { ... }, ... }

Actual outcome:
{ data: undefined, ... }

How to reproduce the issue:
If "... on UserNode" is set, client.query(...) returns { data: undefined, ... }
Example of query:

query ($id: ID!) {
  tournament(id: $id) {
    id
    matches {
      edges {
        node {
          id
          player {
            displayName
            ... on UserNode {
              nick
            }
          }
        }
      }
    }
  }
}

[helfer]

Thanks @krailler! Could you perhaps provide a small reproduction using react-apollo-error-template?

[krailler]

@helfer I solve this using custom IntrospectionFragmentMatcher , see: #1363 (comment), why do I have to use this to work?