gson解析用户信息中extras出现异常

public UserInfoResult getUserInfo(String username)

{
"nickname": "测试00",
"ctime": "2020-04-19 20:53:04",
"extras": {
"key1": "val1",
"key2": "val2"
},
"mtime": "2020-04-19 20:53:04",
"username": "test_00"
}

public T fromJson(JsonReader reader, Type typeOfT)

JsonReader at line 1 column 73 path $.extras.

版本信息：jmessage-client 1.1.11 jiguang-common 1.1.8 gson 2.8.6
如果用户信息中不设置extras，则能正常解析。