Uncaught TypeError: Cannot read property BuyerPhone of undefined at Object.success

Uncaught TypeError: Cannot read property 'BuyerPhone' of undefined at Object.success (customjs.js:1772) at i (jquery.min.js:2) at Object.fireWith [as resolveWith] (jquery.min.js:2) at A (jquery.min.js:4) at XMLHttpRequest.<anonymous> (jquery.min.js:4)

function InvoiceOrQuotePrint(billId, type) {
    var changeText;
    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        url: "abc.aspx/GetData",
        data: JSON.stringify({ InvId: billId, InvType: type }),
        dataType: "json",
        success: function (data) {            
            var html = '';
            var response = data.d.InvoiceReportAllDetails[0];
            var response1 = data.d.IReportAllDetails;
            var BuyerPhone = response.BuyerPhone;
            var BuyerFax = response.BuyerFax;
            var SellerPhone = response.SellerPhone;
            var SellerFax = response.SellerFax;
            var Attn = response.Attn;
            var SellerGstIn2 = response.SellerGstIn;
}

so please help me from this issue