Fehler 28 (Tabellenhandler)

SELECT main.id, main.pid, details.title, details.description, floor(( main.r - main.l) / 2) AS subs, count(article.article_id) as elements, main.level - 2 as level, details.active, details.image, main.l, main.r, details.public FROM xt_catalog_tree AS main LEFT JOIN xt_catalog_tree_nodes AS details ON (details.node_id = main.ID AND details.lang = 'de') LEFT JOIN xt_catalog_tree_articles AS article ON (article.node_id = main.id) WHERE (main.level <= 3 AND details.active = 1 AND main.level <= 3 AND main.l > 2 AND main.r < 109) OR ( main.pid in (0,1,132) AND main.level <= 3 AND main.l > 2 AND main.r < 109) AND details.active = 1 AND main.id !=1 GROUP BY main.l ORDER BY main.l

In File: d:\www\rhena-tronic.ch\docs\xt\plugins\ch.iframe.snode.catalog\category_tree\index.php
On Line: 203
Fatal error: Call to a member function on a non-object in d:\www\rhena-tronic.ch\docs\xt\plugins\ch.iframe.snode.catalog\category_tree\index.php on line 210