From 46a5c568023ab63b72af9b64ea6646b5bc5426ab Mon Sep 17 00:00:00 2001
From: JackDoan <me@jackdoan.com>
Date: Mon, 13 Jul 2026 14:56:19 -0500
Subject: [PATCH] SendVia: don't emit a zero-length packet when prepareSendVia
 fails

---
 inside.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/inside.go b/inside.go
index be61fd34..ed331ebd 100644
--- a/inside.go
+++ b/inside.go
@@ -522,6 +522,11 @@ func (f *Interface) SendVia(via *HostInfo,
 	nocopy bool,
 ) {
 	toSend, err := f.prepareSendVia(via, relay, ad, nb, out, nocopy)
+	if err != nil {
+		// already logged by prepareSendVia
+		return
+	}
+
 	err = f.writers[0].WriteTo(toSend, via.GetRemote())
 	if err != nil {
 		via.logger(f.l).Info("Failed to WriteTo in sendVia", "error", err)