From e80b770481c934b39a89c53953c6cc6c853eaecf Mon Sep 17 00:00:00 2001
From: Sam <lau.sam745033858@gmail.com>
Date: Thu, 11 Mar 2021 16:55:13 +0800
Subject: [PATCH] Fixes https://github.com/Mrs4s/go-cqhttp/issues/708

---
 binary/utils.go    | 3 +++
 client/multimsg.go | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/binary/utils.go b/binary/utils.go
index dfa95bb3..de5163cf 100644
--- a/binary/utils.go
+++ b/binary/utils.go
@@ -38,6 +38,9 @@ func GZipCompress(data []byte) []byte {
 }
 
 func GZipUncompress(src []byte) []byte {
+	if src == nil {
+		return nil
+	}
 	b := bytes.NewReader(src)
 	var out bytes.Buffer
 	r, _ := gzip.NewReader(b)
diff --git a/client/multimsg.go b/client/multimsg.go
index 33bf62c3..91d6dd92 100644
--- a/client/multimsg.go
+++ b/client/multimsg.go
@@ -120,6 +120,9 @@ func decodeMultiApplyDownResponse(_ *QQClient, _ *incomingPacketInfo, payload []
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
 	}
 	uc := binary.GZipUncompress(lb.MsgDownRsp[0].MsgContent)
+	if uc == nil {
+		return nil, errors.New("failed to decompress gzip data")
+	}
 	mt := msg.PbMultiMsgTransmit{}
 	if err = proto.Unmarshal(uc, &mt); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")