From 793f6d96eca0760863bf820184dba148415212ee Mon Sep 17 00:00:00 2001
From: Ingo Schommer <ingo@silverstripe.com>
Date: Sat, 8 Mar 2014 22:18:01 +1300
Subject: [PATCH] Fixed array_key_exists() usage in OrderableRows

---
 code/GridFieldOrderableRows.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/GridFieldOrderableRows.php b/code/GridFieldOrderableRows.php
index 7fa3232..fdf75fe 100755
--- a/code/GridFieldOrderableRows.php
+++ b/code/GridFieldOrderableRows.php
@@ -63,7 +63,7 @@ class GridFieldOrderableRows extends RequestHandler implements
 			$extra = $list->getExtraFields();
 			$table = $list->getJoinTable();
 
-			if(array_key_exists($field, $extra)) {
+			if($extra && array_key_exists($field, $extra)) {
 				return $table;
 			}
 		}