From eb3277f93ef3edd0862dd81b5c6bb50914fa95d1 Mon Sep 17 00:00:00 2001
From: Jitendra Purohit <jitendra@fuzion.co.nz>
Date: Fri, 23 Feb 2018 12:00:11 +0530
Subject: [PATCH] CRM-21795 - Avoid fatal error to be displayed in log files.

---
 CRM/Utils/System/Drupal.php | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/CRM/Utils/System/Drupal.php b/CRM/Utils/System/Drupal.php
index 6a4d669999..b495921210 100644
--- a/CRM/Utils/System/Drupal.php
+++ b/CRM/Utils/System/Drupal.php
@@ -853,10 +853,12 @@ AND    u.status = 1
    * Similar to drupal_exit().
    */
   public function onCiviExit() {
-    if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
-      module_invoke_all('exit');
+    if (function_exists('module_invoke_all')) {
+      if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
+        module_invoke_all('exit');
+      }
+      drupal_session_commit();
     }
-    drupal_session_commit();
   }
 
 }
-- 
2.25.1