diff --git a/cmd.go b/cmd.go
index aa34658..345a752 100644
--- a/cmd.go
+++ b/cmd.go
@@ -20,6 +20,15 @@ const (
 	CMDDAT
 )
 
+const (
+	ACKNONE uint8 = iota<<4 + 3
+	ACKSUCC
+	ACKDATA
+	ACKNULL
+	ACKNEQU
+	ACKERRO
+)
+
 var (
 	ErrMd5Mismatch = errors.New("cmdpacket.decrypt: md5 mismatch")
 )
@@ -91,13 +100,12 @@ func (c *CmdPacket) Refresh(cmd uint8, data []byte, t *tea.TEA) {
 	c.md5 = md5.Sum(data)
 }
 
-//go:nosplit
-func (c *CmdPacket) ClearData() {
-	c.data = nil
-}
-
 //go:nosplit
 func (c *CmdPacket) ReadFrom(f io.Reader) (n int64, err error) {
+	if c.cmd > 0 {
+		err = io.EOF
+		return
+	}
 	buf := (*[1 + 1 + 16 + 255]byte)(unsafe.Pointer(&c.rawCmdPacket))
 	cnt, err := io.ReadFull(f, buf[:1+1+16])
 	if err != nil {
@@ -152,13 +160,14 @@ func (c *CmdPacket) Decrypt(seq uint8) error {
 
 //go:nosplit
 func (c *CmdPacket) Put() {
+	c.cmd = 0
 	c.data = nil
 	pool.Put(c)
 }
 
 //go:nosplit
 func setseq(t *tea.TEA, seq uint8) {
-	*(*uint8)(unsafe.Pointer(uintptr(unsafe.Pointer(t)) + uintptr(15))) = seq
+	*(*uint8)(unsafe.Add(unsafe.Pointer(t), 15)) = seq
 }
 
 // TEA encoding sumtable
diff --git a/go.mod b/go.mod
index fef6818..2fe1502 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/fumiama/go-registry
 
 go 1.17
 
-require github.com/fumiama/gofastTEA v0.0.9
+require github.com/fumiama/gofastTEA v0.0.10
diff --git a/go.sum b/go.sum
index 4a0f386..9882633 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/fumiama/gofastTEA v0.0.9 h1:adaWz+014vMShnLUNWIHLBs0Yv6JNUohcaXZNtct5J0=
-github.com/fumiama/gofastTEA v0.0.9/go.mod h1:RIdbYZyB4MbH6ZBlPymRaXn3cD6SedlCu5W/HHfMPBk=
+github.com/fumiama/gofastTEA v0.0.10 h1:JJJ+brWD4kie+mmK2TkspDXKzqq0IjXm89aGYfoGhhQ=
+github.com/fumiama/gofastTEA v0.0.10/go.mod h1:RIdbYZyB4MbH6ZBlPymRaXn3cD6SedlCu5W/HHfMPBk=
diff --git a/reg.go b/reg.go
index d6941cf..8ad9fb7 100644
--- a/reg.go
+++ b/reg.go
@@ -107,10 +107,10 @@ func (r *Regedit) Get(key string) (string, error) {
 		return "", ErrDecAck
 	}
 	a := string(p.data)
-	if a == "erro" {
+	if a == "erro" && p.cmd == ACKERRO {
 		return "", ErrInternalServer
 	}
-	if a == "null" {
+	if a == "null" && p.cmd == ACKNULL {
 		return "", ErrNoSuchKey
 	}
 	return a, nil
@@ -145,10 +145,10 @@ func (r *Regedit) Set(key, value string) error {
 		return ErrDecAck
 	}
 	a := BytesToString(ack.data)
-	if a == "erro" {
+	if a == "erro" || ack.cmd == ACKERRO {
 		return ErrInternalServer
 	}
-	if a != "data" {
+	if a != "data" && ack.cmd != ACKDATA {
 		return ErrUnknownAck
 	}
 	p.Refresh(CMDDAT, StringToBytes(value), r.ts)
@@ -167,10 +167,10 @@ func (r *Regedit) Set(key, value string) error {
 		return ErrDecAck
 	}
 	a = BytesToString(ack.data)
-	if a == "erro" {
+	if a == "erro" || ack.cmd == ACKERRO {
 		return ErrInternalServer
 	}
-	if a != "succ" {
+	if a != "succ" && ack.cmd != ACKSUCC {
 		return ErrUnknownAck
 	}
 	return nil
@@ -202,20 +202,20 @@ func (r *Regedit) Del(key string) error {
 		return ErrDecAck
 	}
 	a := BytesToString(ack.data)
-	if a == "erro" {
+	if a == "erro" || ack.cmd == ACKERRO {
 		return ErrInternalServer
 	}
-	if a == "null" {
+	if a == "null" || ack.cmd == ACKNULL {
 		return ErrNoSuchKey
 	}
-	if a != "succ" {
+	if a != "succ" && ack.cmd != ACKSUCC {
 		return ErrUnknownAck
 	}
 	return nil
 }
 
 func (r *Regedit) ack(c *CmdPacket) error {
-	// c.ClearData()
+	c.cmd = 0
 	_, err := io.Copy(c, r.conn)
 	return err
 }
diff --git a/reg_test.go b/reg_test.go
index 581670c..17aff34 100644
--- a/reg_test.go
+++ b/reg_test.go
@@ -11,7 +11,7 @@ func TestReg(t *testing.T) {
 		t.Fatal(err)
 	}
 	v, err := r.Get("test")
-	if err != nil {
+	if err != nil && err != ErrNoSuchKey {
 		t.Fatal(err)
 	}
 	t.Log(v)
@@ -29,10 +29,10 @@ func TestReg(t *testing.T) {
 		t.Fatal(err)
 	}
 	v, err = r.Get("test")
-	if err != nil {
+	t.Log(v)
+	if err != ErrNoSuchKey {
 		t.Fatal(err)
 	}
-	t.Log(v)
 	err = r.Close()
 	if err != nil {
 		t.Fatal(err)