Merge pull request #2146 from davecivicrm/CRM-13900

CRM-13900 - Fix back to report URL.

CRM/Mailing/Page/Event.php

@@ -79,7 +79,7 @@ class CRM_Mailing_Page_Event extends CRM_Core_Page {
       $backUrlTitle = ts('Back to Mailing');
     }
     else {
-      $backUrl = CRM_Utils_System::url('civicrm/mailing', 'reset=1');
+      $backUrl = CRM_Utils_System::url('civicrm/mailing/report', "reset=1&mid={$mailing_id}");
       $backUrlTitle = ts('Back to Report');
     }