1 files changed, 1 insertions, 1 deletions
diff --git a/app/php/controls/TimezoneSelect.php b/app/php/controls/TimezoneSelect.php
index 3302e2a..592a9e7 100644
--- a/app/php/controls/TimezoneSelect.php
+++ b/app/php/controls/TimezoneSelect.php
@@ -10,7 +10,7 @@ class TimezoneSelect extends TTemplateControl {
     }
 
     public function setUserToChange(DbUser $user) {
-        if ($user->IsGuest) {
+        if ($user->IsGuest && !$this->Page->IsCallBack) {
             throw new TInvalidDataValueException(
                 'Timezone preference change impossible for guest user'
             );