diff --git a/app/index.html b/app/index.html
index 469a910..4df86ec 100644
--- a/app/index.html
+++ b/app/index.html
@@ -1451,7 +1451,7 @@ function validateInvoice() {
   const errors = [];
   const ino = (document.getElementById("ino")?.value || "").trim();
   if (!ino) errors.push(t("val-invoice-no") || "Invoice number is required");
-  const fromName = (document.getElementById("from_name")?.value || "").trim();
+  const fromName = (document.getElementById("sn")?.value || "").trim();
   if (!fromName) errors.push(t("val-from-name") || "Sender name is required");
   const ctPick = document.getElementById("ct-pick");
   if (!ctPick || !ctPick.value) errors.push(t("val-charge-to") || "Charge-to is required");