Index: trunk/kernel/include/permissions.php
===================================================================
diff -u -r342 -r674
--- trunk/kernel/include/permissions.php	(.../permissions.php)	(revision 342)
+++ trunk/kernel/include/permissions.php	(.../permissions.php)	(revision 674)
@@ -101,7 +101,8 @@
 
     function LoadCategory($Id)
     {
-        if($this->GroupId == NULL)
+        if(!is_numeric($Id)) $Id = 0;
+    	if($this->GroupId == NULL)
         {
             $sql = "SELECT * FROM ".$this->SourceTable." WHERE CatId=$Id AND Type=0 AND GroupId IS NULL";
         }