Index: trunk/core/kernel/db/dblist.php
===================================================================
diff -u -N -r2600 -r2640
--- trunk/core/kernel/db/dblist.php	(.../dblist.php)	(revision 2600)
+++ trunk/core/kernel/db/dblist.php	(.../dblist.php)	(revision 2640)
@@ -465,7 +465,12 @@
 			$lang = $this->Application->GetVar('m_lang');
 			$field = 'l'.$lang.'_'.$field;
 		}
-
+		
+		if( !isset($this->Fields[$field]) )
+		{
+			trigger_error('<span class="debug_error">Incorrect sorting</span> defined (field = <b>'.$field.'</b>; direction = <b>'.$direction.'</b>) in config for prefix <b>'.$this->Prefix.'</b>', E_USER_WARNING);
+		}
+		
 		$this->OrderFields[] = Array($field, $direction);
 	}