NPE during event subscription lookup

public class EventSubscriptionManager extends AbstractManager {

  // ...

  public List<EventSubscriptionEntity> findEventSubscriptionsByNameAndExecution(String type, String eventName, String executionId, boolean lockResult) {

    // ...

      for (EventSubscriptionEntity subscription : eventSubscriptions) {
        if(subscription.getEventName().equals(eventName) && subscription.getEventType().equals(type)) {
          result.add(subscription);
        }
      }