From 118838fb79c774464b058c319104919b27b06632 Mon Sep 17 00:00:00 2001
From: ChrissiQ <rediahs@gmail.com>
Date: Thu, 31 May 2018 11:56:51 -0600
Subject: [PATCH] Fixes "undefined offset" error when moving a many_many item
 to previous page (#121)

When viewing the last page of a list of data objects, trying to move one of them to the previous page triggers an "undefined offset" error.
---
 src/Forms/GridFieldSortableRows.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Forms/GridFieldSortableRows.php b/src/Forms/GridFieldSortableRows.php
index 0570a3d..fca0b22 100644
--- a/src/Forms/GridFieldSortableRows.php
+++ b/src/Forms/GridFieldSortableRows.php
@@ -656,7 +656,7 @@ class GridFieldSortableRows implements GridField_HTMLProvider, GridField_ActionP
 
             $i = 1;
             foreach ($items as $obj) {
-                if ($obj->ID == $targetItem->ID) {
+                if ($obj->ID == $targetItem->ID || $i >= count($sortPositions)) {
                     continue;
                 }