diff --git a/wp-admin/admin-functions.php b/wp-admin/admin-functions.php
index f9d6cc868b..7a6c9edbaf 100644
--- a/wp-admin/admin-functions.php
+++ b/wp-admin/admin-functions.php
@@ -1025,7 +1025,8 @@ function meta_form() {
 		GROUP BY meta_key
 		ORDER BY meta_id DESC
 		LIMIT $limit" );
-	natcasesort( $keys );
+	if ( $keys )
+		natcasesort($keys);
 ?>
 <h3><?php _e( 'Add a new custom field:' ) ?></h3>
 <table id="newmeta" cellspacing="3" cellpadding="3">