Index: t3lib/class.t3lib_db.php
===================================================================
--- t3lib/class.t3lib_db.php	(revision 3818)
+++ t3lib/class.t3lib_db.php	(working copy)
@@ -1044,7 +1044,7 @@
 		$output = array();
 
 		$columns_res = mysql_query('SHOW CHARACTER SET', $this->link);
-		while ($row = mysql_fetch_assoc($columns_res)) {
+		if ($columns_res) while ($row = mysql_fetch_assoc($columns_res)) {
 			$output[$row['Charset']] = $row;
 		}