Keep old behaviour

Author: Exca-DK

l1/eth_subscriber.go

@@ -2,11 +2,13 @@ package l1
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math/big"
 	"time"
 
 	"github.com/NethermindEth/juno/l1/contract"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -66,14 +68,14 @@ func (s *EthSubscriber) FinalisedHeight(ctx context.Context) (uint64, error) {
 	reqTimer := time.Now()
 	head, err := s.ethClient.HeaderByNumber(ctx, finalizedBlockNumber)
 	if err != nil {
+		if errors.Is(err, ethereum.NotFound) {
+			s.listener.OnL1Call("eth_getBlockByNumber", time.Since(reqTimer))
+			return 0, fmt.Errorf("finalised block not found")
+		}
 		return 0, fmt.Errorf("get finalised Ethereum block: %w", err)
 	}
 	s.listener.OnL1Call("eth_getBlockByNumber", time.Since(reqTimer))
 
-	if head == nil {
-		return 0, fmt.Errorf("finalised block not found")
-	}
-
 	return head.Number.Uint64(), nil
 }