https://www.admidio.org/forum/viewtopic.php?t=10062

Author: Fasse

adm_program/system/classes/Session.php

@@ -68,6 +68,11 @@ public function __construct(Database $database, string $cookiePrefix = '')
             $sessionId = session_id();
         }
 
+        if ($sessionId === '') {
+            session_regenerate_id();
+            $sessionId = session_id();
+        }
+
         $this->cookieAutoLoginId = $cookiePrefix . '_AUTO_LOGIN_ID';
 
         if (is_int($sessionId)) {
@@ -356,6 +361,7 @@ public function regenerateId()
         session_regenerate_id();
 
         $this->setValue('ses_session_id', session_id());
+        $this->setValue('ses_timestamp', DATETIME_NOW);
         $this->save();
     }