diff --git a/client/multimsg.go b/client/multimsg.go
index 000794e0..f498b4ed 100644
--- a/client/multimsg.go
+++ b/client/multimsg.go
@@ -97,15 +97,23 @@ func decodeMultiApplyDownResponse(_ *QQClient, _ *network.IncomingPacketInfo, pa
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
 	}
 	if len(body.MultimsgApplydownRsp) == 0 {
-		return nil, errors.New("not found")
+		return nil, errors.New("message not found")
 	}
 	rsp := body.MultimsgApplydownRsp[0]
 
+	if rsp.ThumbDownPara == nil {
+		return nil, errors.New("message not found")
+	}
+
 	var prefix string
 	if rsp.MsgExternInfo != nil && rsp.MsgExternInfo.ChannelType == 2 {
 		prefix = "https://ssl.htdata.qq.com"
 	} else {
-		prefix = fmt.Sprintf("http://%s:%d", binary.UInt32ToIPV4Address(uint32(rsp.Uint32DownIp[0])), body.MultimsgApplydownRsp[0].Uint32DownPort[0])
+		ma := body.MultimsgApplydownRsp[0]
+		if len(rsp.Uint32DownIp) == 0 || len(ma.Uint32DownPort) == 0 {
+			return nil, errors.New("message not found")
+		}
+		prefix = fmt.Sprintf("http://%s:%d", binary.UInt32ToIPV4Address(uint32(rsp.Uint32DownIp[0])), ma.Uint32DownPort[0])
 	}
 	b, err := utils.HttpGetBytes(fmt.Sprintf("%s%s", prefix, string(rsp.ThumbDownPara)), "")
 	if err != nil {