How to reset reCaptcha after closing modal window?

Question

JavaScript

There is a function to call reCaptcha

var initRec;
function initRecaptcha(modal) {
    var captcha = modal.find(".g-recaptcha");
    initRec = grecaptcha.render(captcha.attr("id"), {
        "sitekey" : "SITE_KEY",
        "callback" : function(token) {
            captcha.parent().find(".g-recaptcha-response").val(token);
            captcha.parent().submit();
        }
    });
}

when a modal window is called, it is initialized, I also wrote reCaptcha reset when the window is closed

$('.usluga1_btn').click(function() {
    $('.usluga1_popup').bPopup({
        onOpen: function() {
            initRecaptcha($(this));
        },
        onClose: function() {
            grecaptcha.reset(initRec);
        }			
    });
});

however, if you open the window, close it and try to open it again, then the error in the console is

Uncaught Error: reCAPTCHA has already been rendered in this element

i.e., reCAPTCHA did not reset. How to fix?