Index: trunk/core/units/user_groups/user_groups_dbitem.php
===================================================================
diff -u -r7635 -r7855
--- trunk/core/units/user_groups/user_groups_dbitem.php	(.../user_groups_dbitem.php)	(revision 7635)
+++ trunk/core/units/user_groups/user_groups_dbitem.php	(.../user_groups_dbitem.php)	(revision 7855)
@@ -14,12 +14,14 @@
 		*/
 		function GetKeyClause($method=null, $keys_hash = null)
 		{
-			$table_info = $this->getLinkedInfo();
-			$keys_hash = Array(
-				$this->IDField				=>	$this->ID,
-				$table_info['ForeignKey']	=>	$table_info['ParentId'],
-			);
-			
+			$table_info = $this->getLinkedInfo($this->Special);
+			if ($table_info) {
+				// we have parent info, then use it
+				$keys_hash = Array(
+					$this->IDField				=>	$this->ID,
+					$table_info['ForeignKey']	=>	$table_info['ParentId'],
+				);
+			}
 			return parent::GetKeyClause($method, $keys_hash);
 		}