diff --git a/classes/db/queryparts/expression/UpdateExpressionWithoutArgument.class.php b/classes/db/queryparts/expression/UpdateExpressionWithoutArgument.class.php
index 2ee8c019b..ecb528a10 100644
--- a/classes/db/queryparts/expression/UpdateExpressionWithoutArgument.class.php
+++ b/classes/db/queryparts/expression/UpdateExpressionWithoutArgument.class.php
@@ -35,6 +35,10 @@
 		function getArgument(){
 			return null;
 		}
+		
+		function getArguments(){
+			return array();
+		}
 	}