diff --git a/DatabaseMysql.php b/DatabaseMysql.php
index 51d9066..90baa23 100644
--- a/DatabaseMysql.php
+++ b/DatabaseMysql.php
@@ -353,7 +353,7 @@ class DatabaseMysql implements Database
                 }
                 else
                 {
-                    if (is_array($v[0]))
+                    if (is_array(reset($v)))
                         foreach ($v as &$l)
                             $l = "(" . implode(",", array_map(array($this, 'quote'), $l)) . ")";
                     else