diff --git a/core/eth/constants.go b/core/eth/constants.go
index 3b4ff98..1c115ac 100644
--- a/core/eth/constants.go
+++ b/core/eth/constants.go
@@ -1,13 +1,13 @@
 package eth
 
-var (
+const (
 	// ERC20  交易method
 	ERC20_METHOD_TRANSFER = "transfer"
 	ERC20_METHOD_APPROVE  = "approve"
 )
 
 // 默认gas limit估算失败后，21000 * 3 = 63000
-var (
+const (
 	DEFAULT_CONTRACT_GAS_LIMIT = "63000"
 	DEFAULT_ETH_GAS_LIMIT      = "21000"
 	// 当前网络 standard gas price
diff --git a/core/eth/transactionDetail.go b/core/eth/transactionDetail.go
index a9bb0a9..bf0e3d0 100644
--- a/core/eth/transactionDetail.go
+++ b/core/eth/transactionDetail.go
@@ -129,7 +129,7 @@ func (e *EthChain) FetchTransactionDetail(hashString string) (detail *Transactio
 	if receipt.Status == 0 {
 		detail.Status = TransactionStatusFailure
 		// get error message
-		_, errTx := e.RemoteRpcClient.CallContract(ctx, ethereum.CallMsg{
+		_, err := e.RemoteRpcClient.CallContract(ctx, ethereum.CallMsg{
 			From:       msg.From(),
 			To:         msg.To(),
 			Data:       msg.Data(),
@@ -140,8 +140,9 @@ func (e *EthChain) FetchTransactionDetail(hashString string) (detail *Transactio
 			Value:      msg.Value(),
 			AccessList: msg.AccessList(),
 		}, receipt.BlockNumber)
-		if errTx != nil {
+		if err != nil {
 			detail.FailureMessage = err.Error()
+			err = nil
 		}
 
 	} else {