views error on Node Reference to SimpleAd content to target node baed

We have a node type X with a node ref to a SimpleAds node.

We want to display ads related to this refered SimpleAd.

Notice: Undefined index: nid in template_preprocess_views_simpleads() (regel 154 van /.../simpleads/includes/simpleads.theme.inc).

This is due to the fact the views has now a related node and thus more fields available.

      if (isset($data->field_field_ad_category[0])) {
        $tid = $data->field_field_ad_category[0]['raw']['tid'];
        $node = $data->_field_data['nid']['entity'];
        $ads[] = _simpleads_ads_data($node);
      }

A hot fix for us where we grab the first item from the field_data is

        if (isset($data->_field_data['nid'])) {
          $node = $data->_field_data['nid']['entity'];
        }
        else {
          $dummy = $data->_field_data;
          $f = array_shift($dummy);
          $node = $f['entity'];
        }

This is not a patch as I'm not sure how that should look.