Cypher exception in graphql with array parameter

[nllmrrs]

Hi! It's my first time posting here so please advise if anything isn't clear!

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I'm coming across a cypher exception when executing a query with an array parameter via graphql. A simplified version of the query I'm trying to execute is as follows:

CreateTaskWithAsignees(input: ContributionInput): Contribution @cypher(statement: """
      CREATE (task: Contribution $input)
      WITH task
      UNWIND $input.taskMemberIds AS memberId
      MATCH (asignee:Person{id: memberId})
      MERGE (task)<-[:CONTRIBUTED]-(asignee)
      RETURN task
""")

I'm providing the following parameter:

{
  "input": {
    "title": "Create a relationship between a new Task node and potentially multiple asignees",
    "taskGroup": "General",
    "status": "To Do",
    "taskMemberIds": [
        "91f851db-b48f-48ee-8ef4-199ebfe9f701",
        "6a59d48e-d3ae-4472-8f29-91918a49f096"
    ]
  }
}

I can run the query in neo4j browser and it does what I want... but when I try and execute via graphql query, I get the following exception:

{
    "errors": [
        {
            "message": "Failed to invoke procedure `apoc.cypher.doIt`: Caused by: org.neo4j.cypher.internal.v3_5.util.CypherTypeException: Property values can only be of primitive types or arrays thereof",
            "locations": [
                {
                    "line": 2,
                    "column": 3
                }
            ],
            "path": [
                "CreateTaskWithAsignees"
            ],
            "extensions": {
                "code": "INTERNAL_SERVER_ERROR",
                "exception": {
                    "code": "Neo.ClientError.Procedure.ProcedureCallFailed",
                    "name": "Neo4jError"
                }
            }
        }
    ],
    "data": {
        "CreateTaskWithAsignees": null
    }
}

---

Something I suspect is the problem (but I don't know why it's happening!) that I can see in the logs is that the taskMemberIds field of the input parameter is structured like an object instead of an array:

"input": {
        "title": "Create a task in Delic",
        "status": "To Do",
        "taskGroup": "General",
        "taskMemberIds": {
            "0": "91f851db-b48f-48ee-8ef4-199ebfe9f701",
            "1": "6a59d48e-d3ae-4472-8f29-91918a49f096"
        }
    },

---

If anyone could advise as to what's going on, or think of anything I could do to get around it, I'd really appreciate it! Thanks