ErrorException: Catchable Fatal Error: Object of class stdClass could not be converted to string
  #6 /app/source/public/wp-content/themes/planet4-master-theme/exporter-helper.php(162): get_campaign_attachments
  #5 /app/source/public/wp-content/themes/planet4-master-theme/exporter.php(40): include
  #4 /app/source/public/wp-content/themes/planet4-master-theme/classes/class-p4-campaign-exporter.php(31): P4_Campaign_Exporter::single_post_export_data
  #3 /app/source/public/wp-includes/class-wp-hook.php(288): WP_Hook::apply_filters
  #2 /app/source/public/wp-includes/class-wp-hook.php(312): WP_Hook::do_action
  #1 /app/source/public/wp-includes/plugin.php(478): do_action
  #0 /admin.php(401): null