diff --git a/component/socks5/socks5.go b/component/socks5/socks5.go
index 6c58a848..2950819a 100644
--- a/component/socks5/socks5.go
+++ b/component/socks5/socks5.go
@@ -229,6 +229,10 @@ func ClientHandshake(rw io.ReadWriter, addr Addr, command Command, user *User) (
 	}
 
 	if buf[1] == 2 {
+		if user == nil {
+			return nil, ErrAuth
+		}
+
 		// password protocol version
 		authMsg := &bytes.Buffer{}
 		authMsg.WriteByte(1)