childrenOnPath giving Nan about maker.js HOT 3 CLOSED

var makerjs = require('makerjs');

function TextOnPath(font, fontSize, topText, topSpan, bottomText, bottomSpan, baseline, contain, rotate, showPath) {

    var topTextModel = new makerjs.models.Text(font, topText, fontSize);
    var bottomTextModel = new makerjs.models.Text(font, bottomText, fontSize);

    var topArc = new makerjs.paths.Arc([0, 0], 100, 90 - topSpan / 2, 90 + topSpan / 2);
    var bottomArc = new makerjs.paths.Arc([0, 0], 100, 270 - bottomSpan / 2, 270 + bottomSpan / 2);

     var rect = new makerjs.models.Rectangle(1, 1);
    var arc = new makerjs.paths.Arc([13.331144128254737, 3.140174147778744], 7.0420346849616, 103.3236939533026, 104.25739656359501);
	var row = makerjs.layout.cloneToRow(rect, 1);
    makerjs.layout.childrenOnPath(row, arc, 0.5, false, false, true);

    this.models = {
        topText: row
    };
}

TextOnPath.metaParameters = [
    { title: "font", type: "font", value: '*' },
    { title: "font size", type: "range", min: 1, max: 200, value: 24 },
    { title: "top text", type: "text", value: 'This is on top' },
    { title: "top span", type: "range", min: 10, max: 270, value: 150 },
    { title: "bottom text", type: "text", value: 'This is on bottom' },
    { title: "bottom span", type: "range", min: 10, max: 270, value: 150 },
    { title: "baseline", type: "range", min: -1, max: 2, step: 0.1, value: 0.5 },
    { title: "contain", type: "bool", value: true },
    { title: "rotate text", type: "bool", value: true },
    { title: "show path", type: "bool", value: true }
];

module.exports = TextOnPath;