diff --git a/client/client.go b/client/client.go
index 1c4c1674..fb8c09ca 100644
--- a/client/client.go
+++ b/client/client.go
@@ -1053,7 +1053,7 @@ func (c *QQClient) netLoop() {
 		pkt, err := packets.ParseIncomingPacket(data, c.sigInfo.d2Key)
 		if err != nil {
 			c.Error("parse incoming packet error: %v", err)
-			if err == packets.ErrSessionExpired {
+			if err == packets.ErrSessionExpired || err == packets.ErrPacketDropped {
 				break
 			}
 			errCount++
diff --git a/protocol/packets/global.go b/protocol/packets/global.go
index cccdc0fb..167314fa 100644
--- a/protocol/packets/global.go
+++ b/protocol/packets/global.go
@@ -11,6 +11,7 @@ var ErrUnknownFlag = errors.New("unknown flag")
 var ErrInvalidPayload = errors.New("invalid payload")
 var ErrDecryptFailed = errors.New("decrypt failed")
 var ErrSessionExpired = errors.New("session expired")
+var ErrPacketDropped = errors.New("packet dropped")
 
 type ISendingPacket interface {
 	CommandId() uint16
@@ -121,7 +122,7 @@ func ParseIncomingPacket(payload, d2key []byte) (*IncomingPacket, error) {
 func parseSsoFrame(payload []byte, flag2 byte) (*IncomingPacket, error) {
 	reader := binary.NewReader(payload)
 	if reader.ReadInt32()-4 > int32(reader.Len()) {
-		return nil, errors.New("dropped")
+		return nil, ErrPacketDropped
 	}
 	seqId := reader.ReadInt32()
 	retCode := reader.ReadInt32()