have a crash for parse data

Xcode Version 9.3 beta 4 (9Q127n)

follow is the data:

{
"code": 200,
"msg": "OK",
"data": {
"alternative": [],
"favourite": [{
"id": "5adf4fe28bb78e4d9bc17379",
"name": "自选",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "option"
}, {
"id": "5adf4fe28bb78e4d9bc1737a",
"name": "全网",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "all"
}, {
"id": "5adf4fe48bb78e4d9bc1737b",
"name": "BitMEX",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "https://www.bitmex.com/"
}, {
"id": "5adf4fe68bb78e4d9bc1737c",
"name": "币安网",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "https://www.binance.com/"
}, {
"id": "5adf4fe98bb78e4d9bc1737d",
"name": "OKEX",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "https://www.okex.com"
}, {
"id": "5adf4fec8bb78e4d9bc1737f",
"name": "火币Pro",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "https://www.huobipro.com"
}, {
"id": "5adf4fec8bb78e4d9bc17380",
"name": "Bitfinex",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "https://www.bitfinex.com"
}, {
"id": "5adf4fed8bb78e4d9bc17381",
"name": "Bithumb",
"isFavourite": true,
"isRecommend": true,
"logo": "",
"url": "https://www.bithumb.com/"
}]
}
}

have a crash when parse the data :

guard nominalTypeDescriptor.numberOfFields != 0 else {
return []
}

Start by reproducing the crash with the supplied JSON in Xcode 9.3 beta 4, then inspect the parser path containing the nominalTypeDescriptor.numberOfFields guard. Done means this payload parses without crashing; the issue does not name a test or source file to run.

Written by the indexing model from the issue text.