diff --git a/client/c2c_processor.go b/client/c2c_processor.go
index fe8e06dd..d6829592 100644
--- a/client/c2c_processor.go
+++ b/client/c2c_processor.go
@@ -104,7 +104,7 @@ func (c *QQClient) commMsgProcessor(pMsg *msg.Message, info *incomingPacketInfo)
 	if decoder, ok := c2cDecoders[pMsg.Head.GetMsgType()]; ok {
 		decoder(c, pMsg, info)
 	} else {
-		c.Debug("unknown msg type on c2c processor: %v", pMsg.Head.GetMsgType())
+		c.Debug("unknown msg type on c2c processor: %v - %v", pMsg.Head.GetMsgType(), pMsg.Head.GetC2CCmd())
 	}
 }
 
diff --git a/client/group_msg.go b/client/group_msg.go
index 7214fda5..3fb7fcf9 100644
--- a/client/group_msg.go
+++ b/client/group_msg.go
@@ -352,7 +352,14 @@ func decodeMsgSendResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
 	}
 	if rsp.GetResult() != 0 {
-		c.Error("send msg error: %v %v", rsp.GetResult(), rsp.GetErrMsg())
+		switch rsp.GetResult() {
+		case 55:
+			c.Error("send msg error: %v Bot has blocked target's content", rsp.GetResult())
+			break
+		default:
+			c.Error("send msg error: %v %v", rsp.GetResult(), rsp.GetErrMsg())
+			break
+		}
 	}
 	return nil, nil
 }