diff --git a/dashboard/src/views/EmailMailboxesView.vue b/dashboard/src/views/EmailMailboxesView.vue
index 23cadc2e1..89a08f3c6 100644
--- a/dashboard/src/views/EmailMailboxesView.vue
+++ b/dashboard/src/views/EmailMailboxesView.vue
@@ -158,7 +158,7 @@ async function refreshUsage() {
     else if (error) return console.error(error);
 
     mailboxes.value.forEach((m) => {
-      if (usage[m.fullName]) m.usage = usage[m.fullName];
+      m.usage = usage[m.fullName] ?? { diskSize: 0}; // can be missing from response if no email has been received by dovecot
     });
   }