From 5bbb6ba05b7e0aab44438065b319e6adbc08308c Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Tue, 13 Jun 2023 09:36:38 -0300
Subject: [PATCH] add empty tags field if nil before signing.

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

diff --git a/event.go b/event.go
index 8eeb0f3..74f57a1 100644
--- a/event.go
+++ b/event.go
@@ -135,6 +135,10 @@ func (evt *Event) Sign(privateKey string) error {
 		return fmt.Errorf("Sign called with invalid private key '%s': %w", privateKey, err)
 	}
 
+	if evt.Tags == nil {
+		evt.Tags = make(Tags, 0)
+	}
+
 	sk, pk := btcec.PrivKeyFromBytes(s)
 	pkBytes := pk.SerializeCompressed()
 	evt.PubKey = hex.EncodeToString(pkBytes[1:])
@@ -147,5 +151,6 @@ func (evt *Event) Sign(privateKey string) error {
 
 	evt.ID = hex.EncodeToString(h[:])
 	evt.Sig = hex.EncodeToString(sig.Serialize())
+
 	return nil
 }