err in FC content module when tag not assigned to any items

SELECT i.*, ie.*, ty.name AS typename, CASE WHEN CHAR_LENGTH(i.alias) THEN CONCAT_WS(':', i.id, i.alias) ELSE i.id END as slug, CASE WHEN CHAR_LENGTH(c.alias) THEN CONCAT_WS(':', c.id, c.alias) ELSE c.id END as categoryslug, GROUP_CONCAT(rel.catid SEPARATOR ",") as itemcats FROM #__content AS i LEFT JOIN #__flexicontent_items_ext AS ie on ie.item_id = i.id LEFT JOIN #__flexicontent_types AS ty on ie.type_id = ty.id LEFT JOIN #__flexicontent_cats_item_relations AS rel ON rel.itemid = i.id LEFT JOIN #__categories AS c ON c.id = rel.catid WHERE c.published = 1 AND i.state IN ( 1, -5 ) AND ( i.publish_up = '0000-00-00 00:00:00' OR i.publish_up <= '2012-06-18 19:27' ) AND ( i.publish_down = '0000-00-00 00:00:00' OR i.publish_down >= '2012-06-18 19:27' ) AND i.access <= 1 AND c.id IN (21) AND i.id <> GROUP BY i.id ORDER BY rel.ordering ASC You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY i.id ORDER BY rel.ordering ASC LIMIT 0, 9999' at line 1 SQL=SELECT i.*, ie.*, ty.name AS typename, CASE WHEN CHAR_LENGTH(i.alias) THEN CONCAT_WS(':', i.id, i.alias) ELSE i.id END as slug, CASE WHEN CHAR_LENGTH(c.alias) THEN CONCAT_WS(':', c.id, c.alias) ELSE c.id END as categoryslug, GROUP_CONCAT(rel.catid SEPARATOR ",") as itemcats FROM z1lnt_content AS i LEFT JOIN z1lnt_flexicontent_items_ext AS ie on ie.item_id = i.id LEFT JOIN z1lnt_flexicontent_types AS ty on ie.type_id = ty.id LEFT JOIN z1lnt_flexicontent_cats_item_relations AS rel ON rel.itemid = i.id LEFT JOIN z1lnt_categories AS c ON c.id = rel.catid WHERE c.published = 1 AND i.state IN ( 1, -5 ) AND ( i.publish_up = '0000-00-00 00:00:00' OR i.publish_up <= '2012-06-18 19:27' ) AND ( i.publish_down = '0000-00-00 00:00:00' OR i.publish_down >= '2012-06-18 19:27' ) AND i.access <= 1 AND c.id IN (21) AND i.id <> GROUP BY i.id ORDER BY rel.ordering ASC LIMIT 0, 9999