Cannot read property 'width' of undefined - FusionCharts.HC.js error.

[Cannot read property 'width' of undefined - FusionCharts.HC.js error.]

Hi All.
 
I am using FusionCharts XT 3.3.1-sr2.19840 to render a javascript chart and I get the following error: Cannot read property 'width' of undefined
 
The snippet code that throws this error is (FusionCharts.HC.js):
 

getSmartText: function (d, e, q, l) {
                        if (!this.init) return !1;
                        if (d === void 0 || d === null) d = "";
                        var v = {
                            text: d,
                            maxWidth: e,
                            maxHeight: q,
                            width: null,
                            height: null,
                            oriTextWidth: null,
                            oriTextHeight: null,
                            oriText: d,
                            isTruncated: !1
                        }, i = !1,
                            k, b, f, a, g = -1,
                            c = -1,
                            t = -1,
                            x = this.container,
                            J = this.context,
                            ja = g = 0,
                            la, r = [],
                            w = 0,
                            u = this.showNoEllipses ? "" : "...",
                            g = this.lineHeight,
                            V = function (a) {
                                for (var a = a.replace(/^\s\s*/, ""), b = /\s/, g = a.length; b.test(a.charAt(g -= 1));
                                return a.slice(0, g + 1)
                            };
                        la = J ? function (a) {
                        	return J.measureText(a).width;
                        } : function (a) {
                            x.innerHTML = a;
                            return x.offsetWidth
                        };

In some situations (generally when a = "") the call J.measureText (a) returns undefined and the next call (.width) throws the error.
 
I could not identify why this call returns undefined, or why a = "".
 
Can someone help me with this?
 
Thanks in advance,
 
Felipe Odoni