Image Charts API Question - Undefined Data

Question

When using the Image Charts API, my data is returned as undefined no matter what format it is in. The error message returned from my web service is as follows: Error Message. The purpose of the chart is to signify how many "tasks" a user has, listed by "in progress" or "completed." The server-side code is working (as far as I know, and tested by apirequest.io), and my HTML and JavaScript code seems to be correct as well. Any help is greatly appreciated, and I will have my JS code below.

let chartData = function(){
$("#history-message").html("");
$("#history-message").removeClass();

let the_serialized_data = $("#form-addtask").serialize();
console.log(the_serialized_data);

$.ajax({
    url : endpoint02 + "/chartdata",
    data : the_serialized_data,
    method : "GET",
    success : function(results){
    console.log(results);
        if (results = ""){
            $("#img-pie-chart").hide();
            $("#history-message").html("No history to display.");
            $("#history-message").addClass("alert alert-info");
        } else {
            let inProgress = results[0]
            let complete = results[1]
            let imageurl = "https://image-charts.com/chart?cht=p3&chs=500x500&chd=t:"+inProgress+","+complete+"|"+inProgress+","+complete+"&chan=1000";
            $("#img-pie-chart").attr("src",imageurl);
        }
    },
    error : function(results){
        console.log(results);
    }
})

`}