diff --git a/core/headerchain.go b/core/headerchain.go
index b8ddc4ad9b..478a55bc08 100644
--- a/core/headerchain.go
+++ b/core/headerchain.go
@@ -174,6 +174,9 @@ func (hc *HeaderChain) Reorg(headers []*types.Header) error {
 		)
 
 		for rawdb.ReadCanonicalHash(hc.chainDb, headNumber) != headHash {
+			if frozen, _ := hc.chainDb.Ancients(); frozen == headNumber {
+				break
+			}
 			rawdb.WriteCanonicalHash(batch, headHash, headNumber)
 
 			if headNumber == 0 {
diff --git a/core/rawdb/chain_iterator.go b/core/rawdb/chain_iterator.go
index a3f21c920a..d6d5fd675b 100644
--- a/core/rawdb/chain_iterator.go
+++ b/core/rawdb/chain_iterator.go
@@ -106,8 +106,10 @@ func iterateTransactions(db ethdb.Database, from uint64, to uint64, reverse bool
 		number uint64
 		rlp    rlp.RawValue
 	}
-
-	if to == from {
+	if offset := db.AncientOffSet(); offset > from {
+		from = offset
+	}
+	if to <= from {
 		return nil
 	}
 
diff --git a/eth/state_accessor.go b/eth/state_accessor.go
index b0016e15cc..47c08972f7 100644
--- a/eth/state_accessor.go
+++ b/eth/state_accessor.go
@@ -76,6 +76,9 @@ func (eth *Ethereum) hashState(ctx context.Context, block *types.Block, reexec u
 		// The optional base statedb is given, mark the start point as parent block
 		statedb, database, triedb, report = base, base.Database(), base.Database().TrieDB(), false
 		current = eth.blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1)
+		if current == nil {
+			return nil, nil, fmt.Errorf("missing parent block %v %d", block.ParentHash(), block.NumberU64()-1)
+		}
 	} else {
 		// Otherwise, try to reexec blocks until we find a state or reach our limit
 		current = block
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 2d988ac94e..2781c1a19d 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -678,6 +678,9 @@ func (s *BlockChainAPI) GetTransactionReceiptsByBlock(ctx context.Context, block
 	if err != nil {
 		return nil, err
 	}
+	if receipts == nil {
+		return nil, fmt.Errorf("block %d receipts not found", block.NumberU64())
+	}
 
 	txs := block.Transactions()