From d2a07b10478ddc57d798e9c96f057973e6e4de68 Mon Sep 17 00:00:00 2001
From: Will Rossiter <will@fullscreen.io>
Date: Tue, 27 Aug 2019 11:37:21 +1200
Subject: [PATCH] FIX Remove error when exporting a column that is not
 displayed in a GridField

---
 src/Forms/GridField/GridFieldDataColumns.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Forms/GridField/GridFieldDataColumns.php b/src/Forms/GridField/GridFieldDataColumns.php
index c8dd223da..3c6d49afc 100644
--- a/src/Forms/GridField/GridFieldDataColumns.php
+++ b/src/Forms/GridField/GridFieldDataColumns.php
@@ -154,7 +154,7 @@ class GridFieldDataColumns implements GridField_ColumnProvider
     {
         // Find the data column for the given named column
         $columns = $this->getDisplayFields($gridField);
-        $columnInfo = $columns[$columnName];
+        $columnInfo = array_key_exists($columnName, $columns) ? $columns[$columnName] : null;
 
         // Allow callbacks
         if (is_array($columnInfo) && isset($columnInfo['callback'])) {