Index: branches/unlabeled/unlabeled-1.43.2/admin/install/install_lib.php
===================================================================
diff -u -r6015 -r6038
--- branches/unlabeled/unlabeled-1.43.2/admin/install/install_lib.php	(.../install_lib.php)	(revision 6015)
+++ branches/unlabeled/unlabeled-1.43.2/admin/install/install_lib.php	(.../install_lib.php)	(revision 6038)
@@ -1055,12 +1055,13 @@
 
 		$current_item_tpls = $application->Conn->Query(
 				'SELECT ResourceId, ItemTemplate FROM '.TABLE_PREFIX.'Category
-				 WHERE ParentPath LIKE "'.$root_parent_path.'%"');
+				 WHERE ParentPath LIKE "'.$root_parent_path.'%" AND ItemTemplate != "" AND ItemTemplate IS NOT NULL');
 
 		foreach ($current_item_tpls as $a_cat) {
 			$query = 'UPDATE '.TABLE_PREFIX.'CategoryCustomData
 								SET '.$item_t_customfield.' = '.$application->Conn->qstr($a_cat['ItemTemplate']).'
 								WHERE ResourceId = '.$a_cat['ResourceId'];
+			$application->Conn->Query($query);
 		}
 
 	}