jQuery UI自动完成未捕获的TypeError：无法读取未定义的属性“ 0”

Question

控制台显示此错误：

jquery-3.3.1.js:7972 Uncaught TypeError: Cannot read property '0' of undefined

at val (jquery-3.3.1.js:7972)
at add (jquery-3.3.1.js:8463)
at buildParams (jquery-3.3.1.js:8450)
at Function.jQuery.param (jquery-3.3.1.js:8483)
at Function.ajax (jquery-3.3.1.js:9073)
at $.<computed>.<computed>.source (Index:189353)
at $.<computed>.<computed>._search (VM12 jquery-ui-1.12.1.js:6015)
at $.<computed>.<computed>._search (VM12 jquery-ui-1.12.1.js:144)
at $.<computed>.<computed>.search (VM12 jquery-ui-1.12.1.js:6007)
at $.<computed>.<computed>.search (VM12 jquery-ui-1.12.1.js:144)

，当我开始打字时发送。

我的脚本是

$('#pesticideTypeInput').autocomplete({
    source: function (request, response) {
        $.ajax({
            url: '@Url.Action("GetPesticideTypesList", "Search")',
            dataType: "json",
            data: { search: $('#pesticideTypeInput').val },
            success: function (data) {
                response($.map(data, function (item) {
                    //return { label: item.PesticideTypeAR, value: item.PesticideTypeAR };
                    return item;
                }));
            },
            error: function (xhr, status, error) {
                alert("Error");
            }
        });
    }
});

在我的控制器中，我有：

public JsonResult GetPesticideTypesList(string term)
{
    var pesticidesTypesList = db.PesticideTypes.Where(x => x.PesticideTypeAR.Contains(term)).ToList();
    return new JsonResult {Data=pesticidesTypesList, JsonRequestBehavior=JsonRequestBehavior.AllowGet };
}

我的模型课是：

public partial class PesticideType
{
    public PesticideType()
    {
        this.PesticidesInfoes = new HashSet<PesticidesInfo>();
    }

    public int PesticideTypePk { get; set; }
    public string PesticideTypeAR { get; set; }
    
    public virtual ICollection<PesticidesInfo> PesticidesInfoes { get; set; }
}

感谢您的帮助，谢谢！