--- filepicker.php.original	2011-09-26 16:16:49.036005878 +0200
+++ filepicker.php	2011-09-26 17:52:11.050787048 +0200
@@ -112,13 +112,12 @@
     function exportValue(&$submitValues, $assoc = false) {
         global $USER;
 
-        $draftitemid = $this->_findValue($submitValues);
-        if (null === $draftitemid) {
+         if (!$draftitemid = (int)$this->_findValue($submitValues)) {
             $draftitemid = $this->getValue();
         }
 
         // make sure max one file is present and it is not too big
-        if (!is_null($draftitemid)) {
+        if ($draftitemid) {
             $fs = get_file_storage();
             $usercontext = get_context_instance(CONTEXT_USER, $USER->id);
             if ($files = $fs->get_area_files($usercontext->id, 'user', 'draft', $draftitemid, 'id DESC', false)) {