diff --git a/lib/phplib/Seminar_Auth.class.php b/lib/phplib/Seminar_Auth.class.php
index 6b3a5bebe278d06bb1a6dc09102f0d327f9300b1..bd796fabdc8870c9a48b26d16965f4557399a6e0 100644
--- a/lib/phplib/Seminar_Auth.class.php
+++ b/lib/phplib/Seminar_Auth.class.php
@@ -45,7 +45,7 @@ class Seminar_Auth
      */
     public $auth = []; ## Data array
 
-    public $need_email_activation = false;
+    public $need_email_activation = null;
 
     /**
      *