From ee17d0f8281255e6e875ad17dd2feeee762b1551 Mon Sep 17 00:00:00 2001
From: Lazar <lukic.lazar@yahoo.com>
Date: Mon, 14 Oct 2024 12:18:15 +0200
Subject: [PATCH] fix index-out-of-range

---
 submitter/relayer/relayer.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/submitter/relayer/relayer.go b/submitter/relayer/relayer.go
index 4481d45a..d6091999 100644
--- a/submitter/relayer/relayer.go
+++ b/submitter/relayer/relayer.go
@@ -514,6 +514,10 @@ func (rl *Relayer) buildTxWithData(data []byte, firstTx *wire.MsgTx) (*types.Btc
 		return nil, err
 	}
 
+	if len(rawTxResult.Transaction.TxOut) <= changePosition {
+		return nil, fmt.Errorf("transaction doesn't have change output %s", rawTxResult.Transaction.TxID())
+	}
+
 	rl.logger.Debugf("Building a BTC tx using %s with data %x", rawTxResult.Transaction.TxID(), data)
 
 	_, addresses, _, err := txscript.ExtractPkScriptAddrs(