Index: t3lib/class.t3lib_cs.php
===================================================================
--- t3lib/class.t3lib_cs.php	(revision 6606)
+++ t3lib/class.t3lib_cs.php	(working copy)
@@ -660,7 +660,7 @@
 		foreach($array as $key => $value)	{
 			if (is_array($array[$key]))	{
 				$this->convArray($array[$key],$fromCS,$toCS,$useEntityForNoChar);
-			} else {
+			} elseif (is_string($array[$key])) {
 				$array[$key] = $this->conv($array[$key],$fromCS,$toCS,$useEntityForNoChar);
 			}
 		}