From 1cee22f01c19c33eb7266af569c488558ca72ebd Mon Sep 17 00:00:00 2001
From: colemanw <coleman@civicrm.org>
Date: Tue, 26 Sep 2017 21:34:19 -0400
Subject: [PATCH] CRM-21217 - Conditionally define constant

---
 CRM/Utils/System/Backdrop.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CRM/Utils/System/Backdrop.php b/CRM/Utils/System/Backdrop.php
index a66fbf6549..7de0c8a2cb 100644
--- a/CRM/Utils/System/Backdrop.php
+++ b/CRM/Utils/System/Backdrop.php
@@ -334,7 +334,9 @@ class CRM_Utils_System_Backdrop extends CRM_Utils_System_DrupalBase {
       // SOAP cannot load Backdrop bootstrap and hence we do it the old way
       // Contact CiviSMTP folks if we run into issues with this :)
       $cmsPath = $this->cmsRootPath();
-      define(BACKDROP_ROOT, $cmsPath);
+      if (!defined('BACKDROP_ROOT')) {
+        define(BACKDROP_ROOT, $cmsPath);
+      }
       require_once "$cmsPath/core/includes/bootstrap.inc";
       require_once "$cmsPath/core/includes/password.inc";
 
-- 
2.25.1