diff --git a/hardhat/contracts/LilypadEvents.sol b/hardhat/contracts/LilypadEvents.sol
index 87ecaa2..fbfcd6d 100644
--- a/hardhat/contracts/LilypadEvents.sol
+++ b/hardhat/contracts/LilypadEvents.sol
@@ -106,7 +106,7 @@ contract LilypadEvents is Initializable, AccessControlUpgradeable, UUPSUpgradeab
         LilypadCallerInterface(_to).lilypadFulfilled(address(this), _jobId, _resultType, _result);
     }
 
-    function returnBacalhauError(address _to, uint _jobId, string memory _errorMsg) public onlyRole(UPGRADER_ROLE) {
+    function returnBacalhauError(address _to, uint _jobId, string memory _errorMsg) public {
         BacalhauJobResult memory jobResult = BacalhauJobResult({
             requestor: _to,
             id: _jobId,
diff --git a/main.go b/main.go
index 39ec037..ea95198 100644
--- a/main.go
+++ b/main.go
@@ -10,11 +10,12 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
 )
 
 func main() {
-	ctx := log.Logger.WithContext(context.Background())
+	// bacalhaus sets the default logger using buffered writer, so here just create a new one to ensure logs printed.
+	defaultLog := zerolog.New(os.Stderr).With().Timestamp().Logger()
+	ctx := defaultLog.WithContext(context.Background())
 
 	lvl := zerolog.InfoLevel
 	if level, found := os.LookupEnv("LOG_LEVEL"); found {
@@ -36,6 +37,10 @@ func main() {
 		return
 	}
 
+	if !common.IsHexAddress(os.Getenv("DEPLOYED_CONTRACT_ADDRESS")) {
+		fmt.Fprintln(os.Stderr, "DEPLOYED_CONTRACT_ADDRESS: invalid hex address string")
+		return
+	}
 	addr := common.HexToAddress(os.Getenv("DEPLOYED_CONTRACT_ADDRESS"))
 	privKey, err := crypto.HexToECDSA(os.Getenv("WALLET_PRIVATE_KEY"))
 	if err != nil {