diff --git a/process.go b/process.go
index 5208c97..401d3cb 100644
--- a/process.go
+++ b/process.go
@@ -13,6 +13,15 @@ import (
 func (cc *ClientConn) process(pkt mt.Pkt) {
 	srv := cc.server()
 
+	forward := func(pkt mt.Pkt) {
+		if srv == nil {
+			cc.Log("->", "no server")
+			return
+		}
+
+		srv.Send(pkt)
+	}
+
 	switch cmd := pkt.Cmd.(type) {
 	case *mt.ToSrvNil:
 		return
@@ -23,8 +32,8 @@ func (cc *ClientConn) process(pkt mt.Pkt) {
 		}
 
 		cc.setState(csInit)
-		if cmd.SerializeVer != latestSerializeVer {
-			cc.Log("<-", "invalid serializeVer")
+		if cmd.SerializeVer <= latestSerializeVer {
+			cc.Log("<-", "invalid serializeVer", cmd.SerializeVer)
 			ack, _ := cc.SendCmd(&mt.ToCltKick{Reason: mt.UnsupportedVer})
 
 			select {
@@ -36,8 +45,8 @@ func (cc *ClientConn) process(pkt mt.Pkt) {
 			return
 		}
 
-		if cmd.MaxProtoVer < latestProtoVer {
-			cc.Log("<-", "invalid protoVer")
+		if cmd.MaxProtoVer <= latestProtoVer {
+			cc.Log("<-", "invalid protoVer", cmd.MaxProtoVer)
 			ack, _ := cc.SendCmd(&mt.ToCltKick{Reason: mt.UnsupportedVer})
 
 			select {
@@ -432,22 +441,19 @@ func (cc *ClientConn) process(pkt mt.Pkt) {
 			srv.swapAOID(&cmd.Pointed.(*mt.PointedAO).ID)
 		}
 	case *mt.ToSrvChatMsg:
-		result, isCmd := onChatMsg(cc, cmd)
-		if !isCmd {
-			break
-		} else if result != "" {
-			cc.SendChatMsg(result)
-		}
-
-		return
-	}
+		go func() {
+			result, isCmd := onChatMsg(cc, cmd)
+			if !isCmd {
+				forward(pkt)
+			} else if result != "" {
+				cc.SendChatMsg(result)
+			}
+		}()
 
-	if srv == nil {
-		cc.Log("->", "no server")
 		return
 	}
 
-	srv.Send(pkt)
+	forward(pkt)
 }
 
 func (sc *ServerConn) process(pkt mt.Pkt) {
diff --git a/proxy.go b/proxy.go
index 1375e1d..e9ad2c4 100644
--- a/proxy.go
+++ b/proxy.go
@@ -16,7 +16,7 @@ import (
 const (
 	latestSerializeVer = 28
 	latestProtoVer     = 39
-	versionString      = "5.5.0-dev-83a7b48bb"
+	versionString      = "5.4.1-dev-b2596eda3"
 	maxPlayerNameLen   = 20
 	bytesPerMediaBunch = 5000
 )