--- filepicker.php.original	2011-09-26 13:38:30.201432733 +0200
+++ filepicker.php	2011-09-26 13:56:12.654500468 +0200
@@ -115,7 +115,7 @@
     function exportValue(&$submitValues, $assoc = false) {
         global $USER;
 
-        $draftitemid = $this->_findValue($submitValues);
+        $draftitemid = (int)$this->_findValue($submitValues);
         if (null === $draftitemid) {
             $draftitemid = $this->getValue();
         }