Index: branches/version-2_12-dev/data/class/SC_FormParam.php
===================================================================
--- branches/version-2_12-dev/data/class/SC_FormParam.php	(revision 21515)
+++ branches/version-2_12-dev/data/class/SC_FormParam.php	(revision 21517)
@@ -83,5 +83,5 @@
         if (!$seq) {
             foreach ($this->keyname as $val) {
-                if (isset($arrVal[$val])) {
+                if (array_key_exists($val, $arrVal)) {
                     $this->setValue($val, $arrVal[$val]);
                 }