Index: trunk/core/kernel/db/db_event_handler.php
===================================================================
diff -u -r2617 -r2629
--- trunk/core/kernel/db/db_event_handler.php	(.../db_event_handler.php)	(revision 2617)
+++ trunk/core/kernel/db/db_event_handler.php	(.../db_event_handler.php)	(revision 2629)
@@ -1384,7 +1384,7 @@
 							$filter_value[] = $table_name.'`'.$search_field.'` <= '.$value;
 						}
 						
-						$filter_value = '('.implode(') AND (', $filter_value).')';
+						$filter_value = $filter_value ? '('.implode(') AND (', $filter_value).')' : '';
 						
 						$field_processed = true;
 						break;