From 39be46643bb541f1d56c47a1d11a0463000fdf5b Mon Sep 17 00:00:00 2001
From: Nicholas Miller <nick@magekey.com>
Date: Fri, 18 Aug 2017 05:52:56 +0300
Subject: [PATCH] fixed notice when remove column from grid

---
 app/code/Magento/Backend/Block/Widget/Grid/Extended.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/app/code/Magento/Backend/Block/Widget/Grid/Extended.php b/app/code/Magento/Backend/Block/Widget/Grid/Extended.php
index a6ff4dc24b4ef..a8d79011dd360 100644
--- a/app/code/Magento/Backend/Block/Widget/Grid/Extended.php
+++ b/app/code/Magento/Backend/Block/Widget/Grid/Extended.php
@@ -314,7 +314,8 @@ public function removeColumn($columnId)
         if ($this->getColumnSet()->getChildBlock($columnId)) {
             $this->getColumnSet()->unsetChild($columnId);
             if ($this->_lastColumnId == $columnId) {
-                $this->_lastColumnId = array_pop($this->getColumnSet()->getChildNames());
+                $names = $this->getColumnSet()->getChildNames();
+                $this->_lastColumnId = array_pop($names);
             }
         }
         return $this;