diff --git a/src/models/StratumV1Client.ts b/src/models/StratumV1Client.ts
index 17f6e98..69f7e8a 100644
--- a/src/models/StratumV1Client.ts
+++ b/src/models/StratumV1Client.ts
@@ -315,7 +315,7 @@ export class StratumV1Client {
 
 
                 } else {
-                    console.error('Mining Submit validation error');
+                    console.log('Mining Submit validation error');
                     const err = new StratumErrorMessage(
                         miningSubmitMessage.id,
                         eStratumErrorCode.OtherUnknown,
diff --git a/src/models/stratum-messages/SubscriptionMessage.ts b/src/models/stratum-messages/SubscriptionMessage.ts
index c72510e..ada3d12 100644
--- a/src/models/stratum-messages/SubscriptionMessage.ts
+++ b/src/models/stratum-messages/SubscriptionMessage.ts
@@ -14,7 +14,7 @@ export class SubscriptionMessage extends StratumBaseMessage {
     @IsString()
     @MaxLength(128)
     @Transform(({ value, key, obj, type }) => {
-        return obj.params[0] == null ? 'unknown' : SubscriptionMessage.refineUserAgent(obj.params[0]);
+        return obj?.params?.[0] == null ? 'unknown' : SubscriptionMessage.refineUserAgent(obj.params[0]);
     })
     public userAgent: string;