Issue #3482013 by jsacksick, tomtech, nojj, qaiser iqbal, roberto.musa: Error:...

Issue #3482013 by jsacksick, tomtech, nojj, qaiser iqbal, roberto.musa: Error: Call to a member function getTimestamp() on int in Drupal\commerce_license\EventSubscriber\LicenseRenewalCartEventSubscriber->onCartEntityAdd()

Closes #3482013

src/Entity/License.php

@@ -4,6 +4,7 @@ namespace Drupal\commerce_license\Entity;
 
 use Drupal\commerce\EntityOwnerTrait;
 use Drupal\commerce\Interval;
+use Drupal\commerce_license\Plugin\Commerce\LicensePeriod\LicensePeriodInterface;
 use Drupal\commerce_license\Plugin\Commerce\LicenseType\LicenseTypeInterface;
 use Drupal\commerce_order\Entity\OrderInterface;
 use Drupal\commerce_product\Entity\ProductVariationType;
@@ -550,6 +551,9 @@ class License extends ContentEntityBase implements LicenseInterface {
     $interval_object = new Interval($allow_renewal_window_interval, $allow_renewal_window_period);
 
     $renewal_window_start_time = new DrupalDateTime('@' . $this->getExpiresTime());
+    if ($renewal_window_start_time->getTimestamp() === LicensePeriodInterface::UNLIMITED) {
+      return FALSE;
+    }
     $this->renewalWindowStartTime = $interval_object->subtract($renewal_window_start_time)->getTimestamp();
     return $this->renewalWindowStartTime < \Drupal::time()->getRequestTime();
   }