Superfish Menu Plugin - v1.7.4 Problem: TypeError: o is undefined

Superfish Menu Plugin - v1.7.4 Problem: TypeError: o is undefined

Hi,

Firebug is reporting the error TypeError: o is undefined in the clearTimeout(o.sfTimer) statements in Superfish 1.7.4 highlighted here:

over = function () {
                var $this = $(this),
                    o = getOptions($this);
                clearTimeout(o.sfTimer);
                $this.siblings().superfish('hide').end().superfish('show');
            },
            out = function () {
                var $this = $(this),
                    o = getOptions($this);
                if (ios) {
                    $.proxy(close, $this, o)();
                }
                else {
                    clearTimeout(o.sfTimer);
                    o.sfTimer = setTimeout($.proxy(close, $this, o), o.delay);
                }
            },

The errors occur when hover expands or contracts the displayed menu.

Testing initially on Firefox 26 / Windows 7SP1.

Has anyone else come across this?  Any ideas what the problem might be - internal Superfish or my usage of it?

JPL