the application attempted to write an object with no provided id but the store already contains an id of code example

Example: nvariant Violation: Store error: the application attempted to write an object with no provided id but the store already contains an id of JuristicCustomer_529958 for this object.

/* Ensure your query has an id */

query getEvent($eventId: ID!) {
    Event(id:$eventId) {
      id
      headline
      photo
      location
      startTime
      creator {
        id
        username
        photo
      }
    }
  }