CRM-21795 - Avoid fatal error to be displayed in log files.

diff --git a/CRM/Utils/System/Drupal.php b/CRM/Utils/System/Drupal.php
index 6a4d669999a5e549d9afb0ddb6100516ce0a6f1b..b495921210cffd036c7d6288d594c41755fcc16d 100644 (file)
--- 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();
   }
 
 }