diff --git a/workflow/engine/classes/XmlFormFieldTextPm.php b/workflow/engine/classes/XmlFormFieldTextPm.php
index 20ca0d411..f3c5fcd99 100644
--- a/workflow/engine/classes/XmlFormFieldTextPm.php
+++ b/workflow/engine/classes/XmlFormFieldTextPm.php
@@ -75,7 +75,7 @@ class XmlFormFieldTextPm extends XmlFormFieldSimpleText
      * @param eter string owner
      * @return string
      */
-    public function renderGrid($values = array(), $owner)
+    public function renderGrid($values = array(), $owner = null, $paramDummy3 = null, $paramDummy4 = null)
     {
         $result = array();
         $r = 1;