From f6a94595ace124761b9c423f7655b63db48e6545 Mon Sep 17 00:00:00 2001
From: Bartosz Kubicki <bartosz.kubicki@lizardmedia.pl>
Date: Sat, 22 Sep 2018 19:07:05 +0200
Subject: [PATCH] Fix for custom product attribute changing 'backend_type' when
 'is_user_defined = 1' and get updated/saved in Admin Backend

Fix for custom product attribute changing 'backend_type' when 'is_user_defined = 1' and get updated/saved in Admin Backend

Fix for custom product attribute changing 'backend_type' when 'is_user_defined = 1' and get updated/saved in Admin Backend
---
 .../Controller/Adminhtml/Product/Attribute/Save.php       | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Attribute/Save.php b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Attribute/Save.php
index b9f9b739f4fa3..de27143c6c1ad 100644
--- a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Attribute/Save.php
+++ b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Attribute/Save.php
@@ -222,14 +222,14 @@ public function execute()
                 $data['backend_model'] = $this->productHelper->getAttributeBackendModelByInputType(
                     $data['frontend_input']
                 );
+
+                if ($model->getIsUserDefined() === null) {
+                    $data['backend_type'] = $model->getBackendTypeByInput($data['frontend_input']);
+                }
             }
 
             $data += ['is_filterable' => 0, 'is_filterable_in_search' => 0];
 
-            if ($model->getIsUserDefined() === null || $model->getIsUserDefined() != 0) {
-                $data['backend_type'] = $model->getBackendTypeByInput($data['frontend_input']);
-            }
-
             $defaultValueField = $model->getDefaultValueByInput($data['frontend_input']);
             if ($defaultValueField) {
                 $data['default_value'] = $this->getRequest()->getParam($defaultValueField);