diff --git a/app/Livewire/Ui/Domain/Modal/DomainCreateModal.php b/app/Livewire/Ui/Domain/Modal/DomainCreateModal.php
index d45da6e..6811673 100644
--- a/app/Livewire/Ui/Domain/Modal/DomainCreateModal.php
+++ b/app/Livewire/Ui/Domain/Modal/DomainCreateModal.php
@@ -261,7 +261,7 @@ class DomainCreateModal extends ModalComponent
             'max_mailboxes' => $this->max_mailboxes,
 
             'default_quota_mb' => $this->default_quota_mb,
-            'max_quota_per_mailbox_mb' => $this->max_quota_per_mailbox_mb,
+            'max_quota_per_mailbox_mb' => $this->max_quota_per_mailbox_mb ?? 0,
             'total_quota_mb' => $this->total_quota_mb,
 
             'rate_limit_per_hour' => $this->rate_limit_per_hour,