ckeditor issue : need to click twice on submit button for submitting form

Question

this is my validation code, when ckeditor is empty it's get error but when fill up ckeditor textarea have to click twice on submit button to submit form.

$('#form').validate({
            ignore: [],
            rules: {
                title: {
                    required: true
                },
                description: {
                    required: true
                }
            },
            messages: {
                title: {
                    required: 'The title field is required.'
                },
                description: {
                    required: 'The description field is required.'
                }
            },
            submitHandler: function(form, event) {
                event.preventDefault();
                CKEDITOR.instances.description.updateElement();
                form.submit();
            }
        });