how can i click on another element, when original was not found?

I've created a function to select the payment randomly (number). when the first selection (number) is not found (try catch) then I want to select another one.

But I always receive:

Failed: Cannot read property 'click'

when sending number 8 and it should select credit cart visa...

What am i doing wrong? The elements are really there and the id is also correct:

CheckoutPage3.prototype.selectPayment = function (number) {
    if (number == 1) {
        try {
            this.elementPaymentPaypal.click().then(function () {
                return 1;
            }, function (err) {
                console.log("payment not found, select new");
                this.elementPaymentCreditCard.click();
                this.elementCreditVISA.click();
                number = 2;
            });
        }
        catch (err) {
            console.log('error occured');
        }
    }
    else if (number == 2) {
        this.elementPaymentCreditCard.click();
        this.elementCreditVISA.click();
        number = 2;
    } else if (number == 3) {
        this.elementPaymentCreditCard.click();
        this.elementCreditMasterCard.click();
        number = 3;
    }
    else if (number == 4) {
        try {
            this.elementPaymentCreditCard.click();
            this.elementCreditAmericanExpress.click().then(function () {
                number = 4;
            }, function (err) {
                console.log("payment not found, select new");
                this.elementCreditVISA.click();
                number = 2;
            });
        }
        catch (err) {
            console.log('error occured');
        }
    }
    else {
        try {
            this.elementPrePayment.click().then(function () {
                number = 5;
            }, function (err) {
                console.log("payment not found, select new");
                this.elementPaymentCreditCard.click();
                this.elementCreditVISA.click();
                number = 2;
            });
        }
        catch (err) {
            console.log('error occured');
        }
    }
};