Fatal errors

HI,

Barion is now showing fatal errors on backend and even frontend after customers try to pay.

That is really horrible.

2021-11-29T16:21:07+00:00 CRITICAL Uncaught Error: Call to a member function format() on null in /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXXX/web/wp-content/plugins/pay-via-barion-for-woocommerce/includes/class-wc-gateway-barion-request.php:253
Stack trace:
#0 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-content/plugins/pay-via-barion-for-woocommerce/includes/class-wc-gateway-barion-request.php(52): WC_Gateway_Barion_Request->set_payer_account_information(Object(WC_Order), Object(PreparePaymentRequestModel))
#1 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-content/plugins/pay-via-barion-for-woocommerce/class-wc-gateway-barion.php(212): WC_Gateway_Barion_Request->prepare_payment(Object(WC_Order))
#2 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(439): WC_Gateway_Barion->process_payment(6527)
#3 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-includes/class-wp-hook.php(303): WC_Form_Handler::pay_action(Object(WP))
#4 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array)
#5 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-includes/plugin.php(518): WP_Hook->do_action(Array)
#6 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-includes/class-wp.php(763): do_action_ref_array('wp', Array)
#7 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-includes/functions.php(1291): WP->main('')
#8 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-blog-header.php(16): wp()
#9 /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/index.php(17): require('/data/f/c/fc2fe...')
#10 {main}
  thrown in /data/f/c/fc2fe6bd-5916-44b4-b9c0-13c5319e4e79/XXXXXX/web/wp-content/plugins/pay-via-barion-for-woocommerce/includes/class-wc-gateway-barion-request.php on line 253

The below highlighted line seems to be causing issues>

$payerAccountInfo->AccountLastChanged = $customer->get_date_modified()->format(DateTime::ISO8601);

Here is the part of the code where this line is included>

private function set_payer_account_information($order, $paymentRequest) {
        $payerAccountInfo = new PayerAccountInformationModel();
        $paymentRequest->PayerAccountInformation = $payerAccountInfo;

        $user = wp_get_current_user();
        if (!$user->exists()) {
            $payerAccountInfo->AccountCreationIndicator = AccountCreationIndicator::NoAccount;

            return;
        }

        $customer = new WC_Customer($user->ID);

        $payerAccountInfo->AccountId = $customer->get_id();
        $payerAccountInfo->AccountCreated = $customer->get_date_created()->format(DateTime::ISO8601);
        $payerAccountInfo->AccountCreationIndicator = $this->get_account_creation_indicator($customer);

        $payerAccountInfo->AccountLastChanged = $customer->get_date_modified()->format(DateTime::ISO8601);
        $payerAccountInfo->AccountChangeIndicator = $this->get_account_change_indicator($customer);
        $this->set_password_changed_indicator($payerAccountInfo);

Regards
Michal