Failing on default value as null for type record

[shivamsharma]

Avro hugger is failing in converting below avro schema.

{
  "date_created": "2019-06-01 18:36:20 -0753",
  "fields": [
    {
      "default": null,
      "name": "device",
      "type": {
        "name": "device_record",
        "type": "record",
        "fields": [
          {
            "default": null,
            "name": "dummy_field",
            "type": [
              "null",
              "string"
            ]
          }
        ]
      }
    }
  ],
  "name": "event",
  "namespace": "help",
  "owner": "shivam",
  "schemaVersion": 1,
  "schema_id": 1,
  "type": "record"
}

error:- Tool generate failed: java.lang.Exception: Invalid default value for field: device type:RECORD pos:0, value: null

If I remove default: null or making type as union then it works fine. But If I use avro-tools it shows just warning and convert schema to class. Can we have same functionality here also.

Note:- Can we have stacktrace print in this tool. Otherwise, it is very difficult to identify the issue.