#vulnerable code 
                              @Override
  public void deliver() {
    if (actor.__internal__IsResumed()) {
      if (isStowed()) {
        internalDeliver(this);
      } else {
        internalDeliver(actor.__internal__Environment().suspended.swapWith(this));
      }
      actor.__internal__NextResuming();
    } else if (actor.isDispersing()) {
      internalDeliver(actor.__internal__Environment().stowage.swapWith(this));
    } else {
      internalDeliver(this);
    }
  } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              @Override
  public void deliver() {
    if (actor.lifeCycle.isResuming()) {
      if (isStowed()) {
        internalDeliver(this);
      } else {
        internalDeliver(actor.lifeCycle.environment.suspended.swapWith(this));
      }
      actor.lifeCycle.nextResuming();
    } else if (actor.isDispersing()) {
      internalDeliver(actor.lifeCycle.environment.stowage.swapWith(this));
    } else {
      internalDeliver(this);
    }
  }