MC-35600: The customer creation page not opens without default group selected

Author: OlgaVasyltsun

app/code/Magento/Customer/Setup/Patch/Data/UpdateDefaultCustomerGroupInConfig.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Customer\Setup\Patch\Data;
+
+use Magento\Customer\Model\GroupManagement;
+use Magento\Customer\Model\Vat;
+use Magento\Framework\Setup\ModuleDataSetupInterface;
+use Magento\Framework\Setup\Patch\DataPatchInterface;
+
+/**
+ * Update default customer group id in customer configuration if it's value is NULL
+ */
+class UpdateDefaultCustomerGroupInConfig implements DataPatchInterface
+{
+    /**
+     * @var ModuleDataSetupInterface
+     */
+    private $moduleDataSetup;
+
+    /**
+     * @var GroupManagement
+     */
+    private $groupManagement;
+
+    /**
+     * @param ModuleDataSetupInterface $moduleDataSetup
+     * @param GroupManagement $groupManagement
+     */
+    public function __construct(
+        ModuleDataSetupInterface $moduleDataSetup,
+        GroupManagement $groupManagement
+    ) {
+        $this->moduleDataSetup = $moduleDataSetup;
+        $this->groupManagement = $groupManagement;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function apply()
+    {
+        $customerGroups = $this->groupManagement->getLoggedInGroups();
+        $commonGroup = array_shift($customerGroups);
+
+        $this->moduleDataSetup->getConnection()->update(
+            $this->moduleDataSetup->getTable('core_config_data'),
+            ['value' => $commonGroup->getId()],
+            [
+                'value is ?' => new \Zend_Db_Expr('NULL'),
+                'path = ?' => GroupManagement::XML_PATH_DEFAULT_ID,
+            ]
+        );
+
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getAliases()
+    {
+        return [];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public static function getDependencies()
+    {
+        return [
+            DefaultCustomerGroupsAndAttributes::class,
+        ];
+    }
+}

app/code/Magento/Customer/etc/adminhtml/system.xml

@@ -40,34 +40,39 @@
                 <field id="default_group" translate="label" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Default Group</label>
                     <source_model>Magento\Customer\Model\Config\Source\Group</source_model>
+                    <validate>required-entry</validate>
                 </field>
                 <field id="viv_domestic_group" translate="label" type="select" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Group for Valid VAT ID - Domestic</label>
                     <source_model>Magento\Customer\Model\Config\Source\Group</source_model>
                     <depends>
                         <field id="auto_group_assign">1</field>
                     </depends>
+                    <validate>required-entry</validate>
                 </field>
                 <field id="viv_intra_union_group" translate="label" type="select" sortOrder="40" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Group for Valid VAT ID - Intra-Union</label>
                     <source_model>Magento\Customer\Model\Config\Source\Group</source_model>
                     <depends>
                         <field id="auto_group_assign">1</field>
                     </depends>
+                    <validate>required-entry</validate>
                 </field>
                 <field id="viv_invalid_group" translate="label" type="select" sortOrder="50" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Group for Invalid VAT ID</label>
                     <source_model>Magento\Customer\Model\Config\Source\Group</source_model>
                     <depends>
                         <field id="auto_group_assign">1</field>
                     </depends>
+                    <validate>required-entry</validate>
                 </field>
                 <field id="viv_error_group" translate="label" type="select" sortOrder="55" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Validation Error Group</label>
                     <source_model>Magento\Customer\Model\Config\Source\Group</source_model>
                     <depends>
                         <field id="auto_group_assign">1</field>
                     </depends>
+                    <validate>required-entry</validate>
                 </field>
                 <field id="viv_on_each_transaction" translate="label" type="select" sortOrder="56" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Validate on Each Transaction</label>