diff --git a/contracts/utils.go b/contracts/utils.go
index 42643b4571..faf86b1c55 100644
--- a/contracts/utils.go
+++ b/contracts/utils.go
@@ -85,7 +85,8 @@ func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, m
 		// Add tx signed to local tx pool.
 		err = pool.AddLocal(txSigned)
 		if err != nil {
-			log.Warn("Fail to add tx sign to local pool.", "error", err, "number", block.NumberU64(), "hash", block.Hash().Hex(), "from", account.Address, "nonce", nonce)
+			log.Error("Fail to add tx sign to local pool.", "error", err, "number", block.NumberU64(), "hash", block.Hash().Hex(), "from", account.Address, "nonce", nonce)
+			return err
 		}
 
 		// Create secret tx.
@@ -114,6 +115,7 @@ func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, m
 			err = pool.AddLocal(txSigned)
 			if err != nil {
 				log.Error("Fail to add tx secret to local pool.", "error", err, "number", block.NumberU64(), "hash", block.Hash().Hex(), "from", account.Address, "nonce", nonce)
+				return err
 			}
 
 			// Put randomize key into chainDb.
@@ -125,6 +127,7 @@ func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, m
 			randomizeKeyValue, err := chainDb.Get(randomizeKeyName)
 			if err != nil {
 				log.Error("Fail to get randomize key from state db.", "error", err)
+				return err
 			}
 
 			tx, err := BuildTxOpeningRandomize(nonce+1, common.HexToAddress(common.RandomizeSMC), randomizeKeyValue)
@@ -141,6 +144,7 @@ func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, m
 			err = pool.AddLocal(txSigned)
 			if err != nil {
 				log.Error("Fail to add tx opening to local pool.", "error", err, "number", block.NumberU64(), "hash", block.Hash().Hex(), "from", account.Address, "nonce", nonce)
+				return err
 			}
 
 			// Clear randomize key in state db.
@@ -216,15 +220,18 @@ func GetRandomizeFromContract(client bind.ContractBackend, addrMasternode common
 	randomize, err := randomizeContract.NewTomoRandomize(common.HexToAddress(common.RandomizeSMC), client)
 	if err != nil {
 		log.Error("Fail to get instance of randomize", "error", err)
+		return -1, err
 	}
 	opts := new(bind.CallOpts)
 	secrets, err := randomize.GetSecret(opts, addrMasternode)
 	if err != nil {
 		log.Error("Fail get secrets from randomize", "error", err)
+		return -1, err
 	}
 	opening, err := randomize.GetOpening(opts, addrMasternode)
 	if err != nil {
 		log.Error("Fail get opening from randomize", "error", err)
+		return -1, err
 	}
 
 	return DecryptRandomizeFromSecretsAndOpening(secrets, opening)
@@ -289,6 +296,7 @@ func DecryptRandomizeFromSecretsAndOpening(secrets [][32]byte, opening [32]byte)
 				intNumber, err := strconv.Atoi(decryptSecret)
 				if err != nil {
 					log.Error("Can not convert string to integer", "error", err)
+					return -1, err
 				}
 				random = int64(intNumber)
 			}
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 4a6f1f5583..cc83bd3d6c 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -865,15 +865,26 @@ func (s *PublicBlockChainAPI) rpcOutputBlock(b *types.Block, inclTx bool, fullTx
 	client, err := s.b.GetIPCClient()
 	if err != nil {
 		log.Error("Fail to connect IPC client for block status", "error", err)
+		return nil, err
 	}
 	var signers []common.Address
 	var filterSigners []common.Address
 	finality := int32(0)
 	if b.Number().Int64() > 0 {
 		addrBlockSigner := common.HexToAddress(common.BlockSigners)
-		signers, err = contracts.GetSignersFromContract(addrBlockSigner, client, b.Hash())
-		if err != nil {
-			log.Error("Fail to get signers from block signer SC.", "error", err)
+		retries := 3
+		for {
+			signers, err = contracts.GetSignersFromContract(addrBlockSigner, client, b.Hash())
+			if err != nil {
+				log.Error("Fail to get signers from block signer SC.", "error", err, "retries", retries)
+				if retries == 0 {
+					return nil, err
+				}
+			} else {
+				break
+			}
+			retries--
+			time.Sleep(100 * time.Millisecond)
 		}
 		// Get block epoc latest.
 		if s.b.ChainConfig().Posv != nil {