From 986d115da797e8b46ea6fd58af42092bb8b8f981 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Felf=C3=B6ldi=20Zsolt?= <zsfelfoldi@gmail.com>
Date: Tue, 10 Feb 2026 14:15:18 +0100
Subject: [PATCH] eth: fix targetView==nil case (#33810)

This PR fixes a panic in a corner case situation when a `ChainEvent` is
received by `eth.Ethereum.updateFilterMapsHeads()` but the given chain
section does not exist in `BlockChain` any more. This can happen during
chain rewind because chain events are processed asynchronously. Ignoring
the event in this case is ok, the final event will point to the final
rewound head and the indexer will be updated.
Note that similar issues will not happen once we transition to
https://github.com/ethereum/go-ethereum/pull/32292 and the new indexer
built on top of this. Until then, the current fix should be fine.
---
 eth/backend.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/eth/backend.go b/eth/backend.go
index aed1542aeb..eaa68b501c 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -495,6 +495,9 @@ func (s *Ethereum) updateFilterMapsHeads() {
 		if head == nil || newHead.Hash() != head.Hash() {
 			head = newHead
 			chainView := s.newChainView(head)
+			if chainView == nil {
+				return
+			}
 			historyCutoff, _ := s.blockchain.HistoryPruningCutoff()
 			var finalBlock uint64
 			if fb := s.blockchain.CurrentFinalBlock(); fb != nil {