From 68c7058a80859dc5de75d3e34708cd1ea2f094e5 Mon Sep 17 00:00:00 2001
From: Sina M <1591639+s1na@users.noreply.github.com>
Date: Thu, 9 Apr 2026 03:19:54 +0200
Subject: [PATCH] core/stateless: fix parsing an empty witness (#34683)

This is to fix a crasher in keeper.
---
 core/stateless/encoding.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/stateless/encoding.go b/core/stateless/encoding.go
index d559178892..1b20c4cb2a 100644
--- a/core/stateless/encoding.go
+++ b/core/stateless/encoding.go
@@ -17,6 +17,7 @@
 package stateless
 
 import (
+	"errors"
 	"io"
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -42,6 +43,9 @@ func (w *Witness) ToExtWitness() *ExtWitness {
 
 // FromExtWitness converts the consensus witness format into our internal one.
 func (w *Witness) FromExtWitness(ext *ExtWitness) error {
+	if len(ext.Headers) == 0 {
+		return errors.New("witness must contain at least one header")
+	}
 	w.Headers = ext.Headers
 
 	w.Codes = make(map[string]struct{}, len(ext.Codes))