From 75f62bc3a7395731b648d64f5c142a236daf710f Mon Sep 17 00:00:00 2001
From: Sanjay Patel <sanjay@wagento.com>
Date: Sat, 19 May 2018 11:23:56 +0530
Subject: [PATCH] #14063 - Wrong invoice prefix in multistore setup due to
 default store id

---
 .../Magento/Sales/Model/ResourceModel/EntityAbstract.php   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/app/code/Magento/Sales/Model/ResourceModel/EntityAbstract.php b/app/code/Magento/Sales/Model/ResourceModel/EntityAbstract.php
index 1b781890e0f7..80612277e68d 100644
--- a/app/code/Magento/Sales/Model/ResourceModel/EntityAbstract.php
+++ b/app/code/Magento/Sales/Model/ResourceModel/EntityAbstract.php
@@ -123,10 +123,15 @@ protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
     {
         /** @var \Magento\Sales\Model\AbstractModel $object */
         if ($object instanceof EntityInterface && $object->getIncrementId() == null) {
+            $store = $object->getStore();
+            $storeId = $store->getId();
+            if ($storeId === null) {
+                $storeId = $store->getGroup()->getDefaultStoreId();
+            }
             $object->setIncrementId(
                 $this->sequenceManager->getSequence(
                     $object->getEntityType(),
-                    $object->getStore()->getGroup()->getDefaultStoreId()
+                    $storeId
                 )->getNextValue()
             );
         }