Ambiguous SQL query

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'nid' in where clause is ambiguous: SELECT node.nid AS entity_id, node.vid AS revision_id, node.type AS bundle, :entity_type AS entity_type FROM {node} node LEFT OUTER JOIN {support_ticket} st ON st.nid = node.nid WHERE (nid IN (:db_condition_placeholder_0)) AND (type IN (:db_condition_placeholder_1)) AND (st.nid IS NULL ) ; Array ( [:db_condition_placeholder_0] => 28 [:db_condition_placeholder_1] => gallery [:entity_type] => node ) in EntityReferenceHandler_base->validateReferencableEntities() (line 159 of /home/dwightt1/public_html/drupal7/sites/all/modules/entityreference/handler/base.inc)