diff --git a/src/screens/SendTxEmbed.tsx b/src/screens/SendTxEmbed.tsx
index 77e3704..00d855c 100644
--- a/src/screens/SendTxEmbed.tsx
+++ b/src/screens/SendTxEmbed.tsx
@@ -273,11 +273,7 @@ export const SendTxEmbed = () => {
     const { requestId, source, origin } = transactionDetails;
     console.log("Rejecting request:", requestId);
     // Check if source is a Window before sending message
-    if (source instanceof Window) {
-      sendMessage(source, SIGN_ONBOARD_TX_RESPONSE, {id: requestId, error: "User rejected the signature request." }, origin);
-    } else {
-      console.error("Cannot send rejection message: source is not a Window");
-    }
+    sendMessage(source as Window, SIGN_ONBOARD_TX_RESPONSE, {id: requestId, error: "User rejected the signature request." }, origin);
     setIsTxApprovalVisible(false);
     setTransactionDetails(null);
     setTxError(null);