From d38d746773c94f52b4c75d7e3a72044f192fd34a Mon Sep 17 00:00:00 2001
From: Daniel Liu <139250065@qq.com>
Date: Tue, 13 Jan 2026 19:19:33 +0800
Subject: [PATCH] core/txpool/legacypool: handle missing head in reset #27479
 (#1909)

---
 core/txpool/legacypool/legacypool.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/txpool/legacypool/legacypool.go b/core/txpool/legacypool/legacypool.go
index 53d7368f84..445a28cefe 100644
--- a/core/txpool/legacypool/legacypool.go
+++ b/core/txpool/legacypool/legacypool.go
@@ -1376,6 +1376,14 @@ func (pool *LegacyPool) reset(oldHead, newHead *types.Header) {
 					"old", oldHead.Hash(), "oldnum", oldNum, "new", newHead.Hash(), "newnum", newNum)
 				// We still need to update the current state s.th. the lost transactions can be readded by the user
 			} else {
+				if add == nil {
+					// if the new head is nil, it means that something happened between
+					// the firing of newhead-event and _now_: most likely a
+					// reorg caused by sync-reversion or explicit sethead back to an
+					// earlier block.
+					log.Warn("Transaction pool reset with missing new head", "number", newHead.Number, "hash", newHead.Hash())
+					return
+				}
 				for rem.NumberU64() > add.NumberU64() {
 					discarded = append(discarded, rem.Transactions()...)
 					if rem = pool.chain.GetBlock(rem.ParentHash(), rem.NumberU64()-1); rem == nil {