Index: trunk/core/kernel/db/db_connection.php
===================================================================
diff -u -N -r4329 -r4446
--- trunk/core/kernel/db/db_connection.php	(.../db_connection.php)	(revision 4329)
+++ trunk/core/kernel/db/db_connection.php	(.../db_connection.php)	(revision 4446)
@@ -567,6 +567,8 @@
 		
 		function doUpdate($fields_hash, $table, $key_clause)
 		{
+			if (!$fields_hash) return true;
+			
 			$fields_sql = '';
 			foreach ($fields_hash as $field_name => $field_value) {
 				$fields_sql .= '`'.$field_name.'` = '.$this->qstr($field_value).',';