diff --git a/src/app/admin/page.tsx b/src/app/admin/page.tsx
index ee81703..46ff6bf 100644
--- a/src/app/admin/page.tsx
+++ b/src/app/admin/page.tsx
@@ -739,7 +739,7 @@ export default function AdminPage() {
                           <div className="grid grid-cols-2 gap-1 text-sm">
                             <span className="text-muted-foreground">Domain(s)</span>
                             <span className="font-mono text-xs">
-                              {smtpStatus.domains?.length > 0 ? smtpStatus.domains.join(", ") : "–"}
+                              {(smtpStatus.domains?.length ?? 0) > 0 ? smtpStatus.domains!.join(", ") : "–"}
                             </span>
                             <span className="text-muted-foreground">Archivierte Mails</span>
                             <span className="font-semibold">{smtpStatus.total_mails?.toLocaleString("de-DE") ?? "–"}</span>