setter is undefined in blur: function

[bonatoc]

console.log returns setter as undefined for this line :

        var options = {};
        options.on = {
            blur: function (e) {
                if (e.editor.checkDirty()) {
                    var ckValue = e.editor.getData();
                    scope.$apply(function () {
        setter(scope, ckValue); // "undefined is not a function"
                    });
                    ckValue = null;
                    e.editor.resetDirty();
                }
            }
        };

Not really a problem for me, because ckValue is filled with data entered "pre-blur", and I can then update my REST service, but still, I'm wondering.