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I cloned one of the Quiz views that comes with the module (quiz_by_taker) and made a few modifications to it (views export is attached). It is triggering a debug line in views:
Debug: 'Handler views_handler_field_node_revision tried to add additional_field nid but node could not be added!' in views_handler_field->add_additional_fields() (line 142 of /var/www/dev/sites/all/modules/views/handlers/views_handler_field.inc).